Don't judge on apperance.
1.) Judge on treatment of strangers.
That's when you see them.
2.) Then judge on treatment of family.
That's when you see them.
3.) Also judge on treatment of friends.
That's when you see them.
1.) you'll see how they treat people they don't care about.
2.) you'll see how they treat people they know completely.
3.) you'll see how they treat people they chose and enjoy being around.
There's always more than meets the eye. If any of the treatment is bad, there's a reason.
If it's snobbish, they're a snob.
If it's hateful, they've been hurt.
If it's just bad, something made them bitter. Find it out before immediately hating that person.