I think he meant something more along the lines of, if everybody thought like you. There would be no Pokemon White players and no way to get the pokemon you were looking for. Selfish probably wasn't the right word to use...
To be fair though, Black players will end up relying on White players that little bit more considering the extra 30 or so pokemon that can only be caught in white. I wouldn't call it parasitic either but it's there and you can't deny it.
you can also transfer pokemon so, it arent only white players who you can get them from.
whats this about anyway? cant someone like one version better than the other without being 'black-centric' or something? if someone says the other version sucks, so what? they dont have to be equally liked