The only thing I find annoying is people who talk with their mouths full.
In fact I think (I realise this is a minority view) the whole "go out for dinner" thing for dates etc. is bollocks. Why? Because when I'm eating I want to enjoy my food and not talk and when I'm chatting someone up I don't wanna be distracted by food

hehe
This goes for family get togethers as well. I mean you wanna catch up and talk so it's annoying when there's all these people talking with their mouths full and choking half the time.