It is. The problem is that what pg says will have a real impact on y combinator companies. Even if we disregard its effect on cliques, and even if you disre

It is. The problem is that what pg says will have a real impact on y combinator companies. Even if we disregard its effect on cliques, and even if you disregard the morale issues that could result from the mentor saying "you're not as fun as these other guys," relationships with investors and end-users could be harmed. I gather that's not the sort of thing you should carelessly mess around with.