Why does my friend keep calling me an incel?

So I am a guy and I have a friend who is a girl and we like to hang out together on the regular but she keeps making jokes and calling me an incel. She also asked me if I have ever dated and I told her now and she laughed and called me a virgin. I just assumed it was just a joke but she keeps calling me these things and I'm confused as to why. I'm autistic btw