I don't think this was rude, but I waited in drive thru so long without even being acknowledged that I finally sarcastically said into the intercom "ok, I guess I'm not here", and squealed my tires out of the parking lot to go somewhere else.
My boyfriend and I go sometimes to a very expensive fondue restaurant in Cleveland where we can easily drop $300 a dinner. If my boyfriend likes the waiter, he can easily leave $100 tip, but we once had a very rude and snobbish waiter who acted the entire night like he was doing some unbelievable chore every time he brought us anything. We are not demanding or difficult to wait on, we just expect to be treated attentively and respectfully when we are spending hundreds of dollars at the restaurant, so we left him a $20 tip for a $300 dinner.
My boyfriend and his friends tend to be rude when they're not treated as well as they feel they are entitled. He once told someone to go to hell. We and a very loud friend once went to the mall, where someone had parked in the middle of the aisle, not even in a parking space. She went inside to tell the mall guard at the desk right inside the door that someone was going to run into the car if it wasn't moved. He answered, while barely glancing up from the book he was reading, that he would do "the best he could", to which she replied "yes well unfortunately you're a mall guard", and walked away.