my biggest pet peeves are:
1. When they have no idea how to act in a social situation/bad manners - table or otherwise..
rudeness in general really.
2. If it isn't going too well...making no effort to try and get rid of awkward silences! Even "so.. it's raining huh?" is better than us both just sitting there wondering when we can leave.
There's a bunch more..I'm not the most tolerant of people, you see
But it's late and stuff so..yeah.