People are so individual that you can't classify them immediately either negatively or positively. It wouldn't be fair to say that all conventionally/stereotypically attractive people are arrogant or stuck up, just like it's not fair to say that about those who aren't conventionally attractive.
There are so many variables its impossible to get a definite answer because there will always be exceptions. There will be unattractive people who are horrible, there will be unattractive people who are lovely. The same is true for the attractive people, for every friendly non-arrogant one, there are bound to be a shrewish, nasty one. It's a fact of life.