Most of the shops in my town I avoid. They probably have ok service, I know some do not, but I do all my own wrenching so only come in for the odd part or two or to get some spokes cut.
One shop called an old girl friend of mine a "nice kickstand" when she brought her mtn bike in for help finding a part for it. Oh, she was pissed. If she didn't know the mechanic she was getting help from she would have walked out right there.
Biggest problem I have is the guys at the shop I go to know me well enough that sometimes they feel like they can look past me to the person who walked in behind me. That's gotten annoying, especially when I'm picking something up that I dropped $250 on.