In my mind, a person's intelligence has nothing to do with how many facts a person has jammed into their brain, how opinionated they are, or how strongly they cling to those opinions.

It has everything to do with how willing a person is, in light of new evidence or arguments, to consider new facts or opinions that conflict with their own.

You don't have to change your mind. But cognitive biases tend to reinforce prejudice against new ideas. Call it "changeism". If we stigmatize it with an "-ism" word, maybe people will be less inclined to think that way.