I’ve often said that in order to redirect a conversation because I don’t like the opinion of the person I’m talking to and not because I’m actually ignorant about the subject.
This happens at work mostly, and I can’t just nuke that bridge with the person because we have to keep being able to work together. I’d like to tell them off for being ignorantly intolerant, but instead it’s more effective to just take away their enthusiasm for whatever they’re talking about. Do it enough times and they’ll eventually find someone else to bother.
I’m in South Carolina, so that wouldn’t work so well here since everyone already knows what that means. I do agree that not giving them the opening to elaborate is key.