Most stems from ignorance. Of which education and constructive debate style education are the best solutions and what you have left, that is the pure hate that need more than blocking in society.

Funny, it was actually education that removed my racist tendencies yet made me look down on those who are fat. One is genetic and unavoidable, the other is 100% the result of choices made by the individual.

Fat shaming is also normal in many Asian countries where they have some of the lowest obesity rates and the longest lifespans in the world.

I don't believe racism "stems from ignorance," and I'm curious why you think so. What makes you say that? Is there some evidence of it, or are you arguing that from hypotheticals or first principles?