Here's what I mean: I have a number of friends who are really sweet, wonderful people. They often get treated badly, however, in part because they don't fit the societal definition of what people (women, particularly--most of them are women) should look like.
On the other hand, there are a few acquaintances who get away with truly obnoxious behavior because they're conventionally attractive. (I can't think of anyone who fits that description who is actually a friend, for the obvious reason that sufficiently obnoxious behavior tends to drive me away, even when I haven't been directly affected by it.)
There's not much I can do about it except try to be a good friend, but it still rankles.