I'm guilty of reacting quite aggressively and shortly tempered if I feel I have been wronged in any way, shape or form..
I lose, or appear to, my temper a lot. A lot of people at work think I'm stuck up, rude.. but that's not really my intentions. I'm just trying to do my job, and unfortunately my job involves working with the public and that sort of thing really makes me stressed out.
If someone makes me feel uncomfortable, I will often act like I didn't hear it... Not sure why, but that's how it is.
If I'm scared, I will usually stand my ground and/or react aggressively (but I don't often think fast enough for instant reactions..? I'll analyze things, let them do whatever, and then decide what I need to say/do..), but it depends on the situation. Customer screaming at you? That's a 'stand your ground and don't react' situation?
I will physically leave a family event if someone upsets/is rude to me, disrespect to my being, feelings or emotions really gets me going. I will then avoid every event that the person in question attends until I believe they've forgotten about it (which takes years sometimes..).
Its not that I want to react like that, but its just what happens and people perceive it as anger/aggression even if I'm try not to have it like that.