The guy that sent that to me is a tough guy and we just argued about how we would react. I am with you and would have got mad; probably given him like one warning to leave me alone, then start talking smack back, then who knows.
My buddy thinks this guy is funny and would just laugh at him if that happened. I wonder if he just says that now knowing it was a joke, but I guess better for him if he can let things go. I'd feel all disrespected and couldn't just take it.