I would think he’s somewhat of an idiot for even wanting such a ridiculous position.
I think he may have had noble sentiments but did not realize what a yapping pack of unthinking PC robots he was on the verge of heading up, and we now probably have one more conservative who was a liberal mugged by reality in the world.
He's making a point about the ludicrous hypocrisy of such organizations.
A Polish Catholic is a minority. So are Evangelical Baptists.
The fact that they are predominantly white is irrelevant. If you can make victim minority groups out of things that people can choose - their sexual deviances, for example - or the fact that they espouse a murderous religion like Islam - then victim categories become meaningless. Everyone is a minority in some way!
The purpose of this campus organization is Hate: hatred of white people, period. That's why they rejected him. It has nothing to do with "inclusiveness", and everything to do with naked hatred and lust for power over those you hate.
He's pointing that out. The fact that they rejected him makes his point.