How to kill an argument: use strawmen fallacies. It to date is a 100% proven failed model. Also, don't forget to use expressions like "trust me in this one" and "you can argue with me but IM SO RIGHT GUYS", without actually providing any evidence, theoretical or practical, about why this is the case. Oh, and don't forget to place arbitrary numbers and percentages "All MMOs target the same 80% target audience! But nobody bothers with the 20%!" without any good justifications about those numbers except that they make work your argument.

The only obvious solution is to learn logic and stop being a twat.