Would go with being ironic- she obviously didn't get that it was meant seriously (though I think she could have being a T and all).
I would bring it up and explain it to her.

No, I've never felt like my T's laugh was inappropriate. I tend to make what most ppl would consider highly inappropriate fun of myself and he does respond positively- laugh, smile, nod... for which I'm grateful. I like this coping mechanism, makes it easier for me to share.