So this guy who is my mate, he keeps saying in front of girls to them "Look how ugly he is!" Half the time the girl has this wtf face look on her and doesn't know how to respond, I just look at him and go...right. and then move onto the next topic.

I'm just not quite sure why he keeps doing this to me trying to make me look bad in front of them and he keeps doing it. How would you handle this?