If DD, age 1 does something a tiny bit cheeky like tug at MILs skirt or giggle or something, MILgiggles as well and then says she is cheeky and pretends to smack her bottom. It isn't hard, at all, and half the time she doesn't actually touch DD, just sort of mimes smacking her.
I don't like it because playfully smacking someone's bum is more flirty to me and also DD has started giggling and pretending to smack back and does it to me!
AIBU? I will 100% accept it if I am ...