I don't think this is mean, but

So a few weeks ago, Myles began asking for a cookie after lunch. I get him one, usually after I get him to say please. The thank-yous are becoming less prodded. This one day I said, really joking to myself, "Are you going to dance for it?"
And he did.
So now everytime he asks for a cookie he dances. I still ask him if he is going to dance for it, since he is already obliging.
Randy's son-in-law Rory said this was mean.
Was it?