People who chew with their mouth open
People who order the most expensive thing on the menu, drink loads and loads of booze and then expect everybody in the group to 'evenly split the bill'. Fuck off.
People who say things like 'no, you can't have it. Stop it, you're being naughty. You're not having one! , no. You're not having it.. (over and over and over and over and over and over and over again)... then OK.. you can have one). I have to jam my fist into my mouth to stop myself saying anything.