I've never used 2C-E or been around people using it, but I have used and administered a ton of psychedelics to people and AFAB people seem to be significantly more afflicted by certain side effects.
I don't really agree with you here, but I think we can both be correct if we account for the different samples. The compositions of our samples depended on a lot of complicated factors including cultural differences between our different peer groups and which have surely shifted a lot since I was your age. To put it another way, we didn't have the same kinds of friends, and the women (or AFABs) who chose to use various drugs 20 years ago may be a very different kind of subset than those who choose to use them now. One thing I can say with confidence is that social relations are totally different now compared to them. There is generally far more emphasis on power relations between people now-an-days, probably because of the dramatic increased stratification of economic power that occurred over this period.
Relatedly, we did not use terms like AFAB in those days, and it wasn't really a big deal even though there were a handful of transgendered people around. Though I must say, there were FAR MORE gender queer / non-confirming people of all shapes and sizes back then, at least in the circles I was adjacent to. Ironically the grand rite of passage for many people back then was coming to proper terms with their sexuality---gay, striaght or bi---and I recall how so many people became so agonized---confused and dysphoric over it. Of course Dr. Kinsey solved that one long ago, pointing out that practically everyone is at least a little bi, and many people prove to be quite flexible in the sexuality over their lifetimes as their life experiences and personal circumstances influence their preferences. By the same token, and noting the absurdly narrow characterizations that seem to pass for "masculine" and "feminine" these days, practically everyone who isn't seriously deranged probably ought to be classified as gender-fluid, but this in turn suggests that nothing really underpins this new notion of gender identity except the fact of identification itself. It is a completely abstract (and very much commodified) thing, divorced from all the substance that makes people---men and women of all sorts---who they really are.
Anyway, I've seen plenty of men including some serious hard-head types be absolutely plowed by certain psychedelics and/or cannabis. I knew one guy who enjoyed his drink, his speed, and his psychedelics all in quite generous portions. He was almost always the most collected, most stable, and most extroverted person at any party as well as the most likely to be the designated driver, regardless of his intoxication level. When it came to cannabis though, he dismissed it as "weak tea", and not worth doing. That was until his girlfriend, my roommate, had a party with pot brownies and persuaded him to try half of one. I'm hypersensitive and knew to only eat one myself. I was standing with him as he was working the grill as he usually did, feeling very nice and high, and all the sudden he just turned and walked away. He abandoned the grill, walked straight to his girlfriend's bedroom, and hid in her bed under her covers until the next morning. Afterwards he said it was the scariest drug trip of his life.
I just keep thinking of examples, each with stories behind them that run counter to this claim. For example, the person I know best who is very insensitive to psychedelics (like you are) is a woman. And speaking of Salvia and women, a roommate of mine invited over a couple young friends of his, twin sisters, Mormons, who had just turned 18. I persuaded them to try smoking some Salvia 6X, which wasn't even difficult because they were of age, it was totally legal, and the church had nothing to say about it. (Coffee? No. Salvia? Yes!) They both hit the pipe like pros and had full blown trips which left them conversing excitedly about philosophy and the nature of reality for hours afterwards. I'm sad I never got to hang out with them again.
I agree that chromosonal configuration likely has a significant impact on metabolic factors that might substantially alter people's drug responses. I just haven't seen any clear trends around me, at least where cannabis and psychedelics are concerned. With 2C-E specifically, I'm trying to recall everyone who I've given it to and how they reacted. I think the numbers of men and women I gave it to were about the same. One woman I gave it to complained of some anxiety and GI discomfort and had a difficult but otherwise normal intensity trip at 12.5 mg. She accepted that her anxiety and GI discomfort may have been interrelated. Another vomited but otherwise had a blast on 15 mg, and she vomits from most psychedelics anyway and MDMA too. A third (the hard head) only got nausea and a mild body high off of something like 40 mg. The others reacted typically with minimal side-effects and had mostly positive trips. Among the men? One had a major freak out on 12.5 mg. Another felt very nauseous and ill on 6 mg. A third seemed to have an ok trip on 15 mg but committed suicide a few months later (probably unrelated). One slept through his 15 mg trip, despite apparently having intense hallucinations of electricity surging through the ground on his walk to the porta-potties in the middle of the night. Plenty of others had fairly typical responses with minimal side effects. The variations I saw between individuals among a small group were so great that I'd probably need 1000 people to establish any sort of gender-biased trend with any confidence, and that's not even considering the whole sampling problem.
When consulted, I generally recommend the same doses of psychedelics regardless of sex or body weight. I care much more about a person's history with the particular drug and with psychedelics and drugs in general. If women these days are indeed tending to react more strongly or adversely to psychedelics than men, then that is definitely news to me and does make me curious as to whether this is a recent phenomenon and what might have caused these apparent changes to occur.