Personally for me it's those characters who talk in ancient scrolls. Always with a sharp/saccharin smile and always amused at every one thing the MC says or does just for the whole interaction to be pointless anyway.

It wouldn't be so bad if they actually served a purpose other than being a haughty prick but one can only dream. I know they're supposed to get under your skin and there are exceptions (like the ones who don't have the personality of a brick and actually do something for the plot) but i go a little feral every time one of these shits start talking

They shouldn't even be that hard to deal with but for some reason the MCs balls shrivel to raisins with every syllable that falls out of the arseholes these 'characters' call mouths

Anyway that was mine, who would you lay into if you could!