MIL jokingly asked if I was pregnant & I lost my shit

On the usual visits to the in laws, I was having a conversation with MIL. I was updating her on what happened in the week and showed her a photo of her son (my husband) & I.

I was wearing a body con dress and took the photo after a drink and a meal. She jokingly commented saying "are you pregnant". And she pointed out my belly

I did not find this funny at all. I told her that's not nice nor is it funny. She said, I'm just joking. I said it's not funny at all and how would you like that if I said it to you.

She said she already looks pregnant (she is overweight) so it doesn't really matter.

I was so angry I just stared at my phone the rest of the visit and didn't say bye. My husband through this all did not once say to her what she did was completely inappropriate. He carried on like nothing had happened. He only asked me once we got to the car whether I was okay.

Is it reasonable for me to be angry at my husband / find it hard to move past if he cant speak to his mother about this?

Mind you, since we got married which was two years ago, she has constantly commented on my body. She keeps saying you need to lose weight. She also compared her weight at my age and said you need to become that weight because when you have kids you will gain weight.

I had just had enough and can't put up with this anymore.

What can I do about this situation with the husband and his dumb mother?