I am getting uncomfortable with my Dentist's racial jokes and I don't know what to do. What do I do?

I have this dentist, let's call him Dr. W, who had gotten on my nerves before. I honestly have no idea why I still go to him. Anyway, he has been making these Jewish jokes while I've been at his office( I'm Jewish). He is also Jewish. However, he wasn't born Jewish, he was born Catholic, he converted. He's been making these Jewish jokes while I've been at his office and I think I'm getting kind of offended. I'm starting to think he converted just for these jokes. He was never really a joke teller before. He seems to think it's okay to make these jokes since he converted(they are bad/hacky jokes btw and as a stand-up comedian it pisses me off even more). I don't know what to do. I've been skeptical of him before but this just really pisses me off.

tldr: Dentist says offensive Jew jokes