With an alien species that changes incredibly - what do you have in common with them? The fact that you live in the same galaxy?
Well, we're both bipedal and are carbon-based, but that's it really...
Humans actually might have a reason on being racists towards the vesudans. After all, we are not just talking about some stupid issue called skin color here...
I'd have to agree there. I mean, it's not like the Vasudans are real nice guys. They're stubborn gits, one of the ways the war started was supposed to be because some Terran used the wrong verb conjugation and insulted everyone. It's silly stuff like that which started the war, plus racism.