Not meaning to be picky worra, but different mental health problems at different times of persons life means they can be vulnerable and still get what they're looking for on MN.
If these were RL interactions my head would have exploded before now, I just couldn't handle the critical judgement in lots of posters answers, but because I'm at arms length and have a bit of control over it doesn't affect me in the same way.
Saying that though, I did struggle for the first time with MN after I was called a bully on a thread a bit ago, so I'm not saying I'm immune to it or anything.