We have a vent/rant thread
here, for next time you just want to vent.
Also, although I agree with some of the sentiment you grasp, why do you feel entitled because you deal with something? Why do you take offence to someone claiming to experience something you (have) experience(d)? I mean what does it matter to you? Do you feel the need for others to validate what you're going through, and therefore others lying about that prevents your validation?
Also, although someone might not be depressed after a bad day, they can still feel like shit. I mean what is depression?
I'm guilty of this, and I'm not trying to tell others how to act as I'm in no place, but when someone is feeling down they need some empathy. Not sympathy, not disdain or contempt, nothing of that sort. Next time you see someone who is feeling bad, in that very moment (irrespective of other moments, which kills that little exclusive 'I have depression' club), think about what you'd want if you were feeling down. How would someone telling you your feelings don't matter because others have it worse? If you were feeling down, how would you want someone to treat you?
You don't see people going to parties and telling people they're not having fun because there's someone else out there having more fun, do you? So why do it with negative emotions?
Anyway, now I'm just ranting. I know that when I feel shit, I don't really give a fuck about making sure other people are feeling okay. I fall into your category, I do feel entitled and carry disdain and my empathy is broken. I'm a piece of shit and I know it, but here you are apologising about offending people, which makes me think you still have something in you that I've lost. You can still be that better person, you can still think 'Hey I know what that feels like, maybe I should go comfort them' and try to comfort them, instead of insulting the moment you're in by telling their feelings aren't valid.
Just a thought, do as you will. I mean what the fuck do I care? It doesn't affect me.