How do you guys respond to an LTR when she tries to run dread on you?

My LTR went to the pool today with 2 of her girlfriends, she's a nurse and has a few days off per week. I asked her how it was going over lunch.

Me: "How's the water park?"

Her: "It's good, super hot out, great day for it"

Me: "See any titties yet?" (inside joke from a day earlier this summer where a chick's top came off at the pool in front of us)

Her: "Lol miraculously no. These boys kept bumping into my butt though"

Me: "Ohh shit! Any of them cute?"

Hasn't responded since. I know she's trying to run some dread on me or maybe a shit test. How else would you have responded? Silence?