Maybe I've lived in San Francisco too long and have become completely soft and mellow. When I go to a dealership and find them rude, I simply play along and move onto another dealership. My life is just too busy and complex to waste my time getting flustered over a car, an object of stuff. Just the way I am...
When it comes to bad dealerships for me, most have been with BMW. There was one time, on a Saturday, that my 2008 M3 oil light came on. And for an M3, which has a 25K motor, you don't take chances with oil! Anyway, I drove down to SF BMW for a top off. And you know what they told me? Sorry, can't help ya. I'm like, "The oil I need (which is highly special btw, and not sold at any retailers outside of BMW, was sitting right there on the shelf near the parts department) is right there, I'll even pay for it." The MANAGER was like, "Sorry, can't help you. Go park your car and come back on Monday."
Mind you, I didn't buy my M3 at SF BMW, but I had purchased two other BMWs from them! Anyway, I said fine, didn't make a hissy fit, drove to Berkeley Weatherford BMW and asked if they could help me, and the manager quickly grabbed a quart and topped off. No charge. Made my day.
My point is that every dealership is different. Some deal with nasty customers all day and cannot bear another complaint, which makes them rude, some are just rude, and some are just awesome when the right attitude is at play.
I always keep a smile on my face, good or bad experience with these guys, and it has gotten me what I want without much fuss including building really solid relationships with the SAs and dealerships I use.
A good attitude in life goes a long way...