The worst thing I've found is mountain locals not wanting to socialize with out-of-towners. Has anyone else noticed this? I find fellow visitors to be friendly, but at some mountains there seems to be a code among locals not to mix with the "tourists". Maybe it's just my experience. (of course this doesn't apply to "local" Bears ;) ) Also, I find it much worse in the West where you have more of a ski bum culture.
I know what you are getting at, but I have found most real locals to be great. They are easy to talk to, on and off the lifts, and they don't mind showing you around a bit. They seem to be proud of the place they live.
I sometimes get the anti-social attitude from newcomers to the resort. The type of guys that have been there for a month, will leave with the snow, but call themselves locals. Condo owners and regular tourists can also have a bit of a chip on their shoulders. This certainly doesn't apply to everybody. But the dishwasher from Toronto or Oz is more likely to have an attitude than a lifetime resident.