Stereotyping is a way for humans to save time on trying to define things. If you've had an experience before with a gay CC, even if it was on a TV sitcom, you'll save this information and use it (= expect the same) the next time you are dealing with CC.
We all are guilty of categorizing people: the Americans, the Brits, the Arabs, the dentists, the pilots, and expect from them some stereotypical kind of behavior, although each one of them has a different identity and is a different individual.
Being aware of all that, I decided to give people (belonging to a certain group) the "benefit of the doubt" and do some "sniffing" before drawing my conclusions (except about lawyers of course. In their case one is allowed to expect the worse).