Broseph saidWe're going to have racism for the next 300 years or however long until we turn into the Star Trek world utopia and have Starfleet Command in San Francisco.
Oh it will happen!
EDIT: I forgot to say fuck those racist assholes. Fuck them all to hell.
Actually, star trek is meant to be an allegory for racism in contemporary times, the vulcans are the chinese, the klingons are the africans, the cardassians are the persians etc lol
It's quite likely, that if we do encounter other alien humanoids in the future, they or we will have differences in level of advancement and there probably be racism then too.
just gotta accept that people will always be different and some people will always be idiots about it.