Campus Sports Marketing interview questions

The interviewer was very inappropriate He asked if I was married, single, if I have kids. I told him I wasn't going to share that info with him, but that I have responsibilities at home. He then assumed I have a lot of kids and said as much. Inappropriate topics for interview! I pointed out that it is illegal to pry for that information or make hiring decisions based on it. He disagreed and asked again if I was single.