Does it matter that she knew he sent it on purpose, it seems designed to be that way. No one sends a text like that to their friend. "Hi I met a random person, should we date?"

A girl with half a brain will know it was sent on purpose and play along.

I think it's funny, if a bit risky, in that she may be unsure and not txt back.

But if she gets the joke and plays along; why not?