I find forums and chatrooms useful because they are contact on my own terms. I can either say something, or not. I can continue the conversation, or not. If I say "sorry, got to go to the shops" or something, no one is going to know any different and can't stop me from leaving. Face to face contact is just awkward and there is far less control. I only usually get angry when I lose that control, especially if someone interrupts me when I'm not in the mood to be interrupted or tries to keep me in a conversation I don't want to be in. How I deal with that anger depends on the situation and how much it annoyed me- sometimes I get over it as soon as that incident ends, other times I can seethe over it for a while.