LJDRVR,
Re things instructors do that annoy students, you took the words out of my mouth. I haven't been instructing long enough for students to annoy me - at the moment, they still mean I get paid to fly.
But some more annoying things instructors do:
Complain vehemently that you keep doing something wrong, when it wasn't you; they've just mixed you up with someone else.
Stare distractedly and hungrily at young blondes while you're taxiing (doing it well for a change), then turn back to you looking as though spending the next hour with you is the most boring thing on earth. They might at least pretend!
Start a long and complicated explanation to distract you when you're just about to round out, when you've rarely yet managed a decent landing, but when this one looks like it's going to be perfect.
Criticise everything you do, just in case by some chance you should be over-confident.
On the other hand, tell you you're doing brilliantly when you've just quite obviously cocked everything up, and when you ask about your mistakes, say nothing more useful than that it'll get better with practice. This usually after many hours of practice that aren't working.