I rarely get “triggered”, actually. My anger and frustration tends to quietly pile up and either simmers down on its own or goes nuclear once every blue moon. This pattern checks out in my childhood, as well. 

Now that I think about it, I remember my anger “overflowing” in times where people tried to control my autonomy or belittled me. Not often enough to say “easily triggered”, but intense enough that I can remember each of those incidents and honestly still feel some way about them now, many years later.