Simple, because White people are good people and the world is better off with more of them. We're generally altruistic, intelligent, and peaceful. We build civilizations rather than destroy them. Everyone ends up better off when more people have those qualities. That sentiment goes beyond any form of racial nepotism, I give the same respect to any other race with similar qualities.
That dude is obviously trying to bait you into saying something that he can attack or dismiss as bigotry or some form of wrongthink that he has been ideologically programmed to fight against without ever considering the valid reasons people have for thinking that way.
