It is rude to be critical of someone's appearance
Rudy hadn't seen his friend in forever, and he now has long hair.
Rudy wants to comment on his friend's hair.
Rudy tells his friend that he pulls off having long hair well.
Rudy tells his friend that he looks like a girl, and he should cut it all off.
Rudy's friend's confidence is greater, and he feels that he made the right choice.
Rudy's friend feels disrespected and doesn't want to hang out with Rudy as much.