If you're asking what someone thinks, and they reply by making a joke or claiming mental disorder, then you've gotten what you've asked for. But if you're going to stand over their shoulder with a paddle while you're asking....
We subscribe here knowing the standards we're held to. I'd rather people didn't start threads like this, but it's their choice.
I'd hope that the standards here on ERA would encourage people to consider why it's not okay to say that membership of a fandom implies mental disorder. It's not just that you'd be likely to get a warning or a ban if you persistently argued on that, though you probably would.
Making blatantly false and harmful statements about marginalised people is unacceptable for good reasons. And there is some good advice in the FAQ to the effect that it's okay to not post.