First of all, what do you see as a snob ? In my opinion it is someone who does those typical activities like playing polo, going out in expensive clubs, … and who attaches a lot of importance to his clothes and especially their brands. But most of all, a snob thinks he’s superior just because of these activities and these clothes. It is obvious that William has all these characteristics (that’s very normal, considering his milieu, his education, …), but does he feel superior ? Well, I think we can’t judge because we don’t know him personally (like others said in this topic). We can only form an idea based on what the press shows us (and even that is very subjective). So, maybe Ava Elisabeth had that impression of William being snobbish because of (again like others already suggested) his shyness and maybe William doesn’t want to make the same mistakes as his mother.
P.S. This is my first post. I hope you understand my English (I’m more into French. Actually, why aren’t there topics where you can have a conversation in other languages ?).