This is going to happen in every intro class because, due to the lack of prerequisites, you don't have to know anything about the subject to enroll, and because they are usually big classes, which increases the chances of un-self aware people which think they know everything enrolling. Prepare yourself for stupid morans attempting to sound smart by arguing every little thing with the professor. I've never taken Psych or Philosophy but it definitely happened in Sociology and a little bit in History. There's no escaping it so take the classes you want and be prepared to feel a little irritated sometimes.