Using my knives without my permission is a huge one.
Whistling. (Drives me nuts.)
Speaking so loudly in a one on one conversation that the entire kitchen can hear you. (I.e. Talking to the guy at the station right next to you and I can hear one side of the conversation very clearly at the other end of the kitchen.)
Grabbing a sharpie from my pocket or grabbing one of my side towels because you don't have one on you. (It always seems to be the guys who give you a hard time about always having two towels on your person. Why is that???}
Leaving your station a mess.
Talking on the phone when you should be working.
Generally, not being organized and squared away for service.
Not really a kitchen peeve, but flip flops. Unless you're in a locker room, at a pool, or within a five minute walk of a major body of water, leave them at home. With the possible exception of a few attractive females, I just don't want to see everyone's feet. :-)