Someone once asked...

won't aliens think that humans are so dumb to live separately and have prejudice against each other?

Someone answered with kindness...

That's assuming that these aliens dont have prejudice in their own society, i guess. But if they dont have it, they might view it as some species behavior, i.e. be scientifically interested in it, but not think we're stupid. Du you lool at animal species' social behaviors and call them stupid?