I don't dislike anyone for their choice of drugs, I just dislike the effects certain drugs have on some people. Personally I smoke weed and use psychedelics, and I realize that some people probably wouldn't like me because I do believe that drugs like LSD, psilocybin, mescaline, etc. allow you to experience hidden truths of the universe that your brain regularly filters out or is unable to access and, sometimes, like to discuss it. I understand that some people don't like to be around me when I'm tripping or stoned, so I don't hang out with them when I'm "under the influence." Same thing goes for me, if I know a friend is drunk or is on their way to being so, I generally head out as I know I don't like being around drunk people. That's not to say I don't mind having a beer or two with friends, but don't like being around people who are shitfaced, breaking things, puking everywhere, etc. Same thing goes for people who are into cocaine, amphetamines, meth, and opiates; I don't mind being around them while they're sober, as long as they're not lying to me or trying to steal from me for a fix (which DOES happen to people with these kinds of dependencies), but I don't want to be around them while they're high as it's just not an enjoyable environment for me. For example, a good buddy of mine used to sell HUGE amounts of heroin up in NYC until he got busted for possession of 1,500gs and spent 25+ years hiding out, and while I don't agree with his past choice of profession, he's a really cool, trustworthy guy with whom I love spending time. On the other hand, another guy I knew developed an opiate problem, lost his job, and ended up stealing $1,200 from me to feed his addiction, so, obviously, I no longer associate with him or his close buddies. And, ultimately, I've met very few people who only smoke pot who would steal from me, and even fewer people who use psychedelics who I've found to be untrustworthy. Whew! /rant.
TL;DR I'm more than happy to associate with anyone, no matter what their drug of choice, as long as they're a good, trustworthy person who I can trust not to stab me in the back for a fix.