Aspects of it. I definitely agree people say things that they wouldn't say to your face, but maybe they would think it? I don't know.
There's a lot of anger on MN and I don't see that very much in my day to day life, from women. It makes me wonder if some people are absolutely boiling with it inside and you just don't know. Sometimes I'll say something and it really triggers someone in a really surprising way. The other day someone got really angry because I said, quite mildly, that I enjoyed my life - that's an interesting reaction that sometimes happens on here. People find difference to be criticism, but we're all different, aren't we, a bit anyway.
There's a lot of anxiety, too, lots of self focused criticism that looks really tiring and hard to live with. Again, I think that's not something people typically share that widely with others.
Definitely something that happens is, because we have such partial, shrouded glimpses of each other through a few words on a screen, people project a lot on to you. I have been very confidently told "facts" about myself or my life that are not true, or even close to true, on here. It's always a curious experience! That's an interesting phenomenon, as is when you see people saying things like "you are me" to relate their own experience to a previous post, even if it's not really very related at all.