IRL, no race of human has any greater capacity for harm than any other. White people, black people, Asian People, Hispanic people, they're all equal in their capabilities. Yet there is bigotry between them.
That's what I'm talking about, that's why I say bigotry doesn't make sense, because Bigotry is all routed in fiction.
The only thing that is needed for Anti-Mutant Bigotry to exist is for Mutants to be defined as an other. Once a line is drawn between Mutants and Other people with Super powers, it makes perfect sense for people to be bigotted against Mutants but not other super powered individuals.