No. If anything, I treat them worse because I get apprehensive around them (with attractive guys, at least) and I get really awkward and distant so as not to alienate them.
There's this one really hot guy I work with that I deliberately avoid talking to because I'm afraid of weirding him out or saying something stupid.
I'm not, like, more nice to people I find attractive, if that's what you're asking. Or at least, if I am, I'm not aware of it and I don't do it consciously.