Honestly, I would stay away from that one..... If I was in that situation, I would feel a bit uncomfortable being around the in laws.
Do you think that maybe you mother in-law has discovered yours/your husband's interest in wrestling and maybe it was meant as, "I don't approve/insult"?
Not a lot of people know about my interests in female combat and I'm sure to many, it could look like a means to something, "sexual". It's something that I don't openly share with everyone. I don't think I would feel comfortable around my boyfriend's mother if she knew about my wrestling experience. I haven't done anything I'm shamed of, I just don't think it would be something she would approve of or understand.
You have a lot of companies on the internet who have distorted what female wrestling is really about.
Once again, I think you should walk away from that topic and not respond to any comments that are made in that regard.