I don't know why some people get their panties in a bunch if someone wants to match parts on their mountain bike. If the seat he finds comfortable comes in a color that will look cool and match his bike, why not? Same with any other parts on anyone else's bike.
I actually think the white one looked better because it tied the white fork in with the rest of the bike, but the white one wouldn't have stayed white for long anyway so it hardly matters. Orange one looks sweet too, and will continue to look good.