It was the first definition in the list that came up: I didn't spend any time looking to see what definition of bigotry best suited my understanding. So I agree it isn't brilliant. But once you start including things like prejudice and ignorance and harm and (as one definition did) reasonableness then the whole thing starts to slip away. An outright racist will often think he is reasonable and is preventing harm and that everyone else is ignorant of "what is really going on".

So despite its limitations that does encapsulate the key features for me.