What does it mean when a guy makes fun of a girl's clothes in front of his friends?

Anonymous
I am a quiet, nice, and soft-spoken person. In college, there is this guy in two of my classes. We have never talked before. He is talkative and have a lot of friends. When class was over, I got up to leave and I heard loud laughing behind me. The laughing was coming from him and the people he sit with and talk to. The laughing did not start until I got up. The guy said, "I know those are cheap jeans." There has been other times he has said things and whispered to other people and laughed about it with the people he sit with.

I wanted to know what does it mean when a guy makes fun of a girl's clothes with his friends? What does it mean when a guy makes fun of a girl with people he sit with? Could he be wanting a reaction from me or want attention? I ignored him and them and they still kept laughing. Why does he do this?
What does it mean when a guy makes fun of a girl's clothes in front of his friends?
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