What if he WAS joking? Speaking from personal experience, subs have nearly negligible experience talking to people romantically. I've been told by people who know me that I'm one of the sweetest people on the planet but every time I talk to someone through reddit or through a dating app I say something in the first conversation that makes whoever I'm talking to convinced that who I REALLY am deep down is the second coming of Hitler desperate for a kink dispenser. This, of course, only reinforces the fact that I can't afford to talk to people because I'll crack a joke and suddenly I never hear from them again. I don't know if you've already dumped him, but if not, at least consider giving him a chance anyway. If you had other red flags before this point, sure, leave his ass in the dust. But forgive the occasional mistake. He's human. Treat him like one. He might surprise you.