I took Korean karate with my then boy friend .
After a while Sensei became like yours. After I broke my nose(not from karate) I asked that no punches be thrown to my face. After that, many of the higher belts ONLY aimed for my face and Sensei laughed. I stayed long enough to become a red belt but the purpose of karate, the discipline, and respect, was lacking. It was toxic and we ended up leaving. Your Sensei sounds like he lacks discipline and respect. I'd get out of that environment if I was you.