What? can I call myself (insert teh epic random object here)?
To which I would reply “sure. If that is how you identify and it makes you happier than I will do that.”
If/when they keep going though, you are then obligated to gently pull the trigger on your rifle and send them back to terf hell.
The last thing reactionaries will see and hear is a sarcastic eyeroll and a deep beleaguered sigh. Maybe the occasional “I’m not mad, I’m just…dissapointed”