IDK, sometimes I get upset with people over things that I then can't articulate my anger over without getting more angry and frustrated because, as far as I'm concerned, they should know better, and thus know exactly what I;m upset about. I end up sort of generally flailing about before I can have an adult conversation about it because I'm still in "holy fuck, I can't believe you actually did/said that" mode, and then of course it comes across as me being irrational or overreacting.