That was more of an insult than a rejection. And even the rejection part of it was something she approached him for. You don’t reject someone who never asked. It’s either a complete lack of social awareness or deliberate cruelty on the girl’s part.

So while I agree that anger isn’t a great response to rejection in general, I think it’s entirely understandable in this case and doesn’t imply a sense of entitlement. A rude retort wouldn’t be uncalled for here.

Also note that there is a difference between feeling anger and expressing it to intimidate. Intimidation (or worse) should not be a part of non-violent social interactions at all. Anger should be managed.