I get pretty mad when I'm trying to relate to someone, and somehow, a problem they had ages ago, now done and other with, is far more worse than my current problem and I should be happy with my 'lesser' problem.
Like, gosh, why the heck did I even open up you in the first place?
Also, when people guilt-trip you into doing something. Ugh, that grinds my gears. That stuff's so manipulative and dirty and it makes me want to punch people in their faces when they do that.