I found this at bipolarcentral, about triggers: What is a Trigger? | Psych Central

It says that a trigger is something -- "retriggering" -- that brings back feelings and memories of trauma, such a ptsd.

I have things that I thought were triggers, but have nothing to do with retriggering of trauma. The Movie thread I started and several of us are discussing, talks about being triggered by certain types of movies, and actually being in the presence of a movie that triggers us. I'm triggered by a movie I don't like, no matter what the subject matter is. I feel trapped by some other person trying to pressure me into watching a movie with him or her.

What are these feelings? Are they triggers even though they have nothing to do with past traumatic events?