[Mindspank]

By saing "I can be a jerk" means you are a jerk all the time, and only act "Nice". I know you to be quite the opposite. You are actually nice, but can act like a jerk sometimes. When someone provokes you to change your mood, your actions do not define you so therefor you cannot be held in the regard of being a "Jerk", but more along the lines of "Upset". Something more temporary, as being a "Jerk" is somewhat of a permanent thing.

This chick, and some of the other PoTM's I have met ARE jerks, and only ACT nice.

So dont sell yourself short like that Yosei.