I get angry when I have to speak to authority figures or people I view as authority figures.
For example, for some reason I'll never understand- I was really really really dissociated, and I was shaking and loopy- and someone asked me if I'd done my homework. I managed to squeak out a "yes".
I'll also get angry if someone says something like "Do you understand?" or something of that nature in a really firm tone; or they'll tell me that I'm mean--- I don't know whether I should be saying "yes" or "no" and that's just so frustrating. Even more frustrating is the fact that silence seems like defiance to me at times... so if my mother asks me to empty the dishwasher or something, and I'm busy with homework or something, I'll just not speak, and then I'll give her the silent treatment because I'm angry at the fact that I'm worried I'll get in trouble for my reaction.
I'm fine just talking to my friends though, just hanging around and joking with them- but if someone asks me my opinion on something or tries to get my insight- I often can't speak because I don't know whether they expect a yes or a no or if I'll get into trouble for my answer later.