Have you encountered a condescending college professor?

Is there anything more annoying?!? I respect people who go for higher education - I'm striving for a degree myself, at the moment - but just because someone was born 8 or so years before I was and has already had the opportunity to get their degree doesn't mean that they should have the right to patronize me! I intend to go for a grad. degree as well ..... just give me a few years! Anybody else have experience with professors that patronize?