it's quite simple, if you act like a child, over and over again, and argue and yell, esp with malice, i'm going to speak they truth and tell you to act more mature. that's one of the reasons i'm posting here, and not at OA.
if he wants to debate the facts or the points i'm fine and would enjoy it, but just throwing insults and basically yelling on a message board, well then, yeah, he should grow up and act his age, if he really is an adult.