Gently let your husband know that if his mom says something negative that he should not pass it along to you. What his mom said did not hurt you until he told you. That’s how I taught my kid not to spread gossip.
As for your mother in law, if she comments that something is messy, hand her a broom. That’s how I got my certified-clean-freak mom to stop making comments. “Vacuum’s in the closet” was another one, but she was my mom, not my MIL, so it wasn’t as hard for me. Sooo…have your husband do it. :)