Why is 'bigotry' bad?

Your alien overlords will finally be able to conquer Earth.

Seriously, are you from our planet?

Bigotry is the tool of the ignorant.

I am from the Planet __________.

Of course he’s from this planet. Just because he’s a robot from the future trying to understand the ways of humans doesn’t mean you have to be rude.

Seriously? You even have to ask? Look, we barely have any evidence that bigfoots exist. It is just plain stupid to hate them before we even discover they are real.