Ok, define "bigotry",

Negative beliefs about a group of people based on weak evidence, and actions that derive from such beliefs, particularly when the group is defined by a characteristic that is difficult or impossible to change.

also explain why "bigotry" as you just defined it is a bad thing.

Extraordinary claims require extraordinary evidence. Claims that are similar to ones that have been proven false in the past and have led to lots of human misery count as extraordinary for these purposes.