your professor is the kind os stupid person who thinks he's inteligent enough to criticize popular things. Toy Story is not about "toys". It's about being replaced by someone new, it's about giving up on being the leader, coping with being forgotten by your friends. That's the main plotline. The subplot, that follows Buzz, is equally devastating, as the astronaut is forced to understand the reality he believed was a lie and he was only one of millions just like him. Those are all very interesting thematics and the way they are treated is very mature for a children's movie. You could even fit a critique to capitalism in it if you want to. But brainlets can't possibly see that.