Background: DH is a really good cook, and enjoys the whole process from start to finish. In contrast, I'm just an okay cook. We each do about 50/50 during the week, but when we are having a party or people over for a meal, DH likes to do it. I help with chopping / prep and things but that's about it. This is a pattern we've fallen into naturally and are both happy with it.
We hosted a meal over the weekend with both sets of parents. As usual from the moment they sit down I had comments from Step-MIL about the fact that DH has cooked. She will laugh, "Oh, what a surprise that you've not cooked Tiffany!" looking sideways at FIL. "Why is DH stuck in the kitchen again Tiffany?" , and this weekend, "Do you ever cook?". 
Every time this happens DH jumps in and explains yet again that he is just the better cook and that he enjoys it, but Step-MIL really seems to judge me for not being the main chef in our household. It seems that she upholds the outdated idea of the woman belonging in the kitchen.
To prepare for having our parents over, I cleaned and tidied the house top to bottom, put away laundry, bought the dinner ingredients from the supermarket, laid the table, made a playlist of music and did most of the conversation-holding -- While DH cooked. In my opinion I did my fair share of hosting, am I missing something?
AIBU to think that we are even partners, regardless of who has done the actual cooking, and I am not the lazy slattern Step-MIL likes to make me out to be?! How does everyone else do it in their homes?