Why would a guy act mean towards a girl he does not know?

In my oppinion... I think it reverts back to kindergarten rules when we are little the way we showed girls we liked them was like chasing them throwing rocks pulling hair you know being mean because we were not quite sure how to approach things some guys still use that to get a girl because it does work the fact that he is going out of his way to try to get some reaction would mean that he may think you are cute and because he knows nthing about you he will do what he can to get attention from you and most people react to meanness compared to kindness because that is human nature...

No offense but guys act mean to people they like sometimes and a guy doesn't have to someone to like them.

Did you find him rude as in he was taunting you in anyway? May be he wants to be friendly with you, trying to know you better and he sees this as a way to find out how sportingly you take his remarks. I don't think he is making fun of your independence of being able to buy your own stuff. May he has respect for you but can't explain it properly. Have you visited the store alone? If not then try once and see his reactions and if he again passes any comments at your shopping then ask him straightaway what his intentions are. We should not be too much judgmental about other people's attitude and his character too early. You still have the best option with you to just ignore him.

Beacause I bet he sees parents buy their kids stuff for them all the time, without them having to work for it. He is just including you into the stereotype of the "Girl with parents who get everything for her (Car, clothes, phone, pay her bills, buy her gas, pay for movies)". I wouldn't blame him really, I see girls like that all the time, and I feel like kicking them and saying "Earn somthing for once in your life!", but hey, I am a judgmental guy.

Really though, while its wrong for him to assume that's who you are, I can't blame him, because he has to watch that happen every day he is at work, and I bet he gets sick of it.

Well maybe that's just his personality. It happened to me to before and there was a time that I really want to yell at him or punch him straight in his face. There are really guys who aren't friendly to girls. I think its just that. Maybe he also doesn't want to be friendly so girls will not misinterpret his kindness

Guys ast mean to girls they like sometimes.. so maybe he likes you and needs a way to speak to you.. hE Might be jsut trying to tease you...

That's his problem. You didn't do anything to him so he doesn't have a right to act like that to you. Next time he does something even slightly rude at his job I would say something to his manager. Or when he makes a comment either to you or your mom ask him what his problem is and tell him all he needs to do is ring you up. Maybe he has seen you from afar and has already prejudged you in his mind. Maybe he thinks you think you're better (usually guys with inferiority complexes are like this).

He could have a bad impression about you from college, possibly from rumors or whatever, and is being judgemental about it. If not, he's being a asshole, because from what I can tell, he's plainly trying to make your life difficult.