There Is No Reasoning With Dementia
It's a thing I have to remind myself of, again and again. People in moderate and severe stages of dementia often are unable to engage in conversations about respect or political correctness. Even if they are, they’ll likely forget the discussion shortly afterward. Instead, the best option is to quickly end their abrasive comments through acknowledgment and redirection. Reasoning with your care recipient or teaching them the error of their thinking is flat-out impossible.
A proactive way for caregivers to avoid conflict in public is to carry a card that says "My companion has dementia. Please be patient. Thank You!" Silently sliding one of these across the counter to a receptionist or server can be a great way to get ahead of potentially stressful interactions.