One of my plates texted out of the blue asking: "Are you my bf?"

I have 3 plates and after having one go rogue causing me a lot of drama I have no intention of elevating any one of them beyond having a great time when we hang out.

My response to that text was: "lol spank your ass"

She replied with a monkey face icon.

Any success stories or insights in how to handle/deflect this question?