That's just a troll. Trolls always push things to get a reaction out of people. They're generally easy to spot, and the ones that get mad when you stop responding are the best because then you get to laugh at them.
Sucks this happened to you, though. If I'd been there, I'd have defended you. A joke is one thing, but when it's pushed too far, that's never cool. Trolls often push things too far.