I had an interview with him. He said “it’s none of your business

I had an interview with him. He said “it’s none of your business” at my question: “how many students do you have”. I thought student teacher ratio is a common question. Even if you don’t want to answer, you can steer it away in a subtle way. I am sure he makes a lot of money and don’t care about one more student, it’s a reflection of professionalism.