Actually. You're wrong. Dead wrong. Just ask Raven.
[Sure, he says a lot he doesn't think about, plenty of mean things have come out of his mouth. And he DOES say things to get a rise but... for some reason he doesn't seem to use appearance or race, not intentionally. Worst case he'd maybe call Zel "pebbles" or something, but it's nothing different than Dean calling him Smurf.
Honestly, he was actually trying to level with Zel and be nice for once. And he's kind of insulted by that assumption. So he'll get up with a scowl and take his leave unless Zel has anything to say.]