UniS, no, it's nothing you've done at all.
It takes me forever to learn about someone. It takes even longer for me to work out group dynamics, and even then I learn almost nothing about it.
Embarrassingly, most of the time I'm on mumsnet I haven't the slightest foggiest idea who is who, let alone matching people up to their real identities. So I have to be hugely careful not to say or do the wrong thing, but invariably I will get some social stuff wrong. I can't remember more than two of the posts at once, so if I go to answer several people at once, I end up staring into space in brain-pain. I can't explain it better than that.
Unfortunately that combo has one of several consequences.
Either a few people get together and talk about how awful I am.
Or they stop talking to me altogether.
Or they get very formal with me as if I'm a complete stranger.
Or they explain what I've done wrong.
Or they shout at me.
Only one of those things helps. All the others lead to a brain wiring fusing which hurts like hell. Actually physically hurts, because the brain wiring I have to use for social stuff is a real mess of badly connected wires that don't connect to names, faces or key details. It takes herculean effort to get it to give up the right info on someone, and a long long time to make sense of it.
So, in a group like this, I absolutely have to assume that I'm friends with everyone and everyone is my friend, because there's no way I can tell the difference between people fast enough.
And because my brain can't 'see' most emotions or faces or expressions or tone of voice etc, it can only see the really big stuff...and that's what it thinks it has to be like. So I tend to be overexpressive as it's the only way that most of my friends can 'see' me and the only way that emotions etc register correctly.
So some people will think I'm being rude for not being able to work out what to say. Others will think I'm being too 'loud' or attention-seeking. Others will incorrectly guess that I'll give away confidential details - I don't. I'm very well trained not to do that. And all in all, unless people know me well, it can end up as a mess. A mess that ends up with me in a right old state for days and days because it's like a computer that has the wrong software instruction and can't re-start.
I take a big risk in joining in with things like this, bigger than people realise. I do it because I love the people here and value their friendship.