I sat in an Apple Store listening to the tearful pleas of a teenager sobbing because the Genius wouldn't replace her MacBook Pro because she spilled a 32 ounce pop on it. She didn't realize that Diet-Pepsi would ruin her MBP, and thought that it was 'SO UNFAIR' (pout) because it was 'an accident' and that Apple wouldn't 'make an exception in this one case' and replace it. I rolled my eyes so hard I swear people could hear them! She left sobbing, still (A+ for Oscar performance), and asking what she could do to 'fix it'. They actually suggested distilled water. I mean, it's already fried, what is a little more liquid going to do, am I right!
Geniuses are probably some of the most tolerant people when it comes to the crap they see and no doubt on a daily basis.
At another Apple Store, a guy started getting hostile over his dropped MBP (screen shattered, touchpad cracked). He thought that just because he yelled louder than necessary to be heard over the din of the store, and acted all huffy and assholish after being told that was 'not covered', that Apple would just bend over and poop out a brand new one On The Spot. Instead they threatened to call the police, and wished him a good day, and watched him as he cursed and stomped his way out of the place. His threats to 'NEVER EVER BUY ANOTHER APPLE PIECE OF 'DOOKY' EVER AGAIN!' (pout stomped foot) made them laugh in the back room, I'm sure.
I have gotten the best service by wearing a suit and tie, and going in and stating what's wrong, and suggesting solutions, and playing dumb when necessary. Not 'stupid', and always treating them nicely. They deserve it...
But that doesn't mean that I haven't had the occasional Genius on an ego trip. I just go get a snack, and come back later. Usually they have forgotten about me, and I get help then from someone else. (Although that one time. A Genius noticed I came back, after I was already talking to a different one, and I relayed all the attitude I got earlier. I think he got a 'talking to'. He wasn't happy that I came back, and after he was talking to another genius while looking at me, I started making hand gestures towards him, and both the new Genius, and I were giving him dirty looks. I just spoke the truth. Got issue solved which was why I went there in the first place) (I think going in in a suit makes them feel like you are from a business (good guess) and they do not want to overly piss off business types) YMMV