from what i've read on Palace forums, Zaha is a bit full of himself, and his form has dropped a lot since he got the england call up, but then again they might be a bit bitter because he is leaving
I have literally heard everything but that, in fact I saw Palace fans blowing up on Twitter, criticizing the media for portraying him that way when training with England. Palace fans adore him. Pretty much everyone says he's the most down to earth guy around, he likes to "entertain" on the pitch so to speak, and tries some outrageous tricks, if that's what they're referring to, but I wouldn't say he's full of himself. Expect a few negative comments now they're resigned to losing him anyways.
He's attracted a ton of attention, teams are loading up on him. The other winger Bolasie has actually probably been more impressive in recent weeks, he actually looks a pretty decent prospect too. They've a lot of young talent.