Am I wrong for feeling this way? Please help.

I’ve been married with my husband 10 years. My in-laws are awesome and I love them dearly, along with my sister in-law. Lately they have made direct comments to my 9 year old son, that he needs to eat all his food. He’s very thin, doesn’t eat much, but he is healthy!! It’s just how his body frame is. But every we go over their house to eat, they make comments about how he needs to eat more, he’s too skinny, and always making jokes about how he needs to eat all his food. This really bothers me. My father in-law, sister in-law, and Brother in-law always make these comments. Whenever we go anywhere to eat or go to their house to eat. It really bothers me. They’re a joking family. My husband never really speaks up for us. Am I wrong for feeling this way?.. my husband says they just joke around...