I strongly dislike it when people are assuming. I mean this as a trait that would be described in my vocabulary as "having the tendency to interpret reality based on arbitrary assumptions that one considers absolutely true, despite a lack of sufficient evidence or even in the face of blatant proof that these assumptions are nothing but crap floating in cognitive vacuum".
Assumption is at the core of everything that would make me scream people's tympana away, if I weren't into meditation, letting go, moving forward being alien and so on and so forth. It's related to introversion because assumptions tend to fill the social void that surrounds me, but, also, because introversion makes me value observation very much, and when people assume, they come out as sloppy observers. Many of these things have been already pointed out in this thread, but just to make an exemplifying list:
Why do you assume I need your advice? I don't, that's why I didn't ask for it.
Why do you assume it is ok to besiege the food? It is not, take what you need and leave: we have living rooms: social spaces for people who want to socialize. Kitchens are for the ones who hide their unsociability behind a passion for cooking and/or like food more than they like people.
Why do you assume that my silence means I desperately want to talk with you? ...?
Why do you assume you know me and psychiatry well enough to "cure me" with a mixture of platitudes aimed at what is not even really something related to my mental issues but rather to my character?
I also dislike being in pictures, unless I'm in the mood for silly pictures. I like silly pictures.
Something that makes me murderous: disrespect of personal space.