My most common pitfall: "not caring" -> "gloomy mood" -> "noting I'm lashing out just a tad" -> "only thing I care about is not making people upset (unfair to them for me to just lash out based on mood)" -> "noting gloomy mood again, and thinking it upsets people" -> repeat 3,4,5 as death spiral down.

I'm actually doing something similar at a macro level right now. I've kind of spiralled myself into a corner: I get negatively triggered by observing certain normal social interactions (among other people), but I refuse to take the resulting bad mood out on my friends and it's strong enough that I have trouble supressing it. Since I don't know how to remove the trigger itself, I've just been avoiding situations where it could come up ... leading to more isolation, more bad moods, etc.

Haven't thought my way out of that one yet.