The tip jar rudeness also bothers me, but not as much as these things do:
—Waiters who ask if you need change. Yes, give me my change. Then I will decide how much I will tip you.
—Waiters who give you five or more $1 bills back as change. No, give me the $5 and the $1, please. I have other money in my pocket, and besides, there's a good chance you were going to get the $5.
—Waiters who give me a free beverage with my meal. Then I feel forced to add the amount of the drink I got for "free" on to the tip. I'd rather give that money to the establishment, not the waiter who is essentially stealing.