These little triggers aren't stupid, but I definitely understand your frustration with them and why you call them that. It's perfectly normal for things in movies or TV shows to trigger these feelings. Much like comedies can trigger us to laugh and horror movies can trigger us to scream, infidelity references can trigger us to feel some of the feelings that we went through during d-day and the days/weeks/months following.
For me, facing the triggers head on, and allowing myself to feel what I felt eventually lessened the effects of the triggers gradually over time. I can now watch King of the Hill again. Dale Gribble's situation still triggers me a bit, but it doesn't flatten me like it used to.
Hang in there, and allow yourself to feel these things. It'll get better with time.