Is it normal to not like almost everyone?

The other day I was in an Einstien bagel in a richer section of town (Im not rich). Most people in this area are rich and have this sense of entitlement and think everyone else is beneath them. She made a beyond rude comment to me when she mistakenly thought I was giving her a dirty look when I was actually not, which really pissed me off.I responded to her with low blows like she was an ugly and old b!%@# and should get some botox and plastic surgery so the world doesn't have to be subjected to her ugliness. Harsh, yes I know, but I'm tired of taking the high road and I feel it is my job to put people like this woman who act like its ok to treat others like they are beneath them in their place. Is this normal?