Should I quit this job?

Ok...so I just recently got a second job as a waitress at a brand new restaurant. I've never worked in the food industry before, only retail and some secretarial work...so waiting tables is not exactly my area of expertise. It's not so hard but there are still certain things about the job that I am uneasy about. The manager only hired me because I am attractive female and not based on my experience. That was my first red flag. Also, he had me come in for training on the second day it was open. Needless to say, everyone was too busy to train me. So I felt like a useless fool. The manager talks down and treats ne like an imbecile and it's very frustrating. I have a lot going on in life right now, and I don't need a second job that makes me more miserable than I already am at this point in time. How should I deal with this situation? Quit? Suck it up? What? I mean I have been working at a store for almost half a year and love it, I'd rather just get a second job at another store.