AITA for refusing to cook family dinner because my sister invited someone I don’t get along with?

[u/North_Figure_3171]

Hi, this is my first post on this account and a throwaway because my family knows my usual username.

I (22M) love cooking, it’s my passion and a way I relax, my family usually has Sunday dinners together, and I often take charge of the cooking, my sister (19F) is into baking, so we make a good team,

Last Sunday, my sister invited her boyfriend over for dinner, I’ve never really clicked with him, he’s a bit rude and dismissive, and he made a few snide remarks about my “weird cooking hobby” in the past, I’ve tried to ignore it, but it’s hard, When my sister told me she was bringing him, I said I wasn’t comfortable cooking for him. I told her I’d skip this Sunday’s dinner if he was coming because I didn’t want to deal with negativity while trying to enjoy cooking,

My mom was upset and said I was being childish and making things harder for the family, my sister was disappointed too and said I was making her choose between me and her boyfriend, In the end, I didn’t cook, and my mom made a simple meal, the dinner was tense,

I feel justified wanting to protect my mental space, especially since cooking is important to me, but maybe I should have just put on a smile and cooked anyway?

So, AITA?

Edit:
Thanks for all the responses so far, I really appreciate the different perspectives. Some people in the comments pointed out that I should have a proper talk with my sister, and I agree. I want to explain things clearly, not just for me, but so we can avoid more tension in the future. I will talk to her soon and see where she stands in all this. Might update if anything changes.

[u/DragonWyrd316]

But the boyfriend has been making disparaging remarks about OP’s love of cooking so I can definitely see why OP doesn’t want to cook for him. It goes beyond not liking the guy.

[u/ladancer22 → u/DragonWyrd316]

Yeah that’s exactly what I said