I'm not an A but I have triggers - it's one thing I work on in therapy. My main triggers involve invasions of privacy....you know it's a trigger because you have a snap reaction - one you just do you don't think about or even have a chance to you just react. Sometimes angrily for me (one of my issues) and sometimes with a food binge. If you google search psychological trigger you can get some good insight.
Since I have them I know they are real...I also know you can train yourself to recognize them and eventually manage them