If you tell us his gamertag and real name, we can all spam him with his real name and irritate him for you :D But seriously though, I only use gamertags if I know no one knows who I'm talking about. If I just found randoms, I'm not going to say, "Follow Caleb." If everyone knows everyone's name, then absolutely use real names, it is easier and more friendly (and yes I am implying that he is not really a friend and you were justified in saying what you said).