How can you tell if an employee is just brown nosing?

I was telling my employee I want to buy this house in Virginia.

"Every brick was handmade by a slave," I said. "Every stone laid by a slave. There are even slave quarters in the back. That's why I want to buy it - because it will make me feel quite in touch with my roots," I said.

"Oh yes, sir, I agree, sir," she said.

She didn't even question my obsession with slavery, and mind you, I am a white man.

So, what's something I can ask/tell her to prove she's just brown-nosing?
How can you tell if an employee is just brown nosing?
How can you tell if an employee is just brown nosing?
Post Opinion