John,
See Scott's answer.

As hard as it is to sometimes remain polite; but in any similar situation where a Realtor wants to "correctly inform" you, simply respond

"I'm sorry that you were misinformed. If someone with your level of experience was misled by such dangerously bad information, it's possible that my Client will be equally confused. I'll be certain to explain why I have said what I have in the callout. Thank you so much for telling me what you had been told."

__________________
The only reason some people get lost in thought is because it's unfamiliar territory.
- Paul Fix