Am I in the wrong…. MIL

I know thanksgiving was a while back but just thought I’d ask about this. My husband and I spent the thanksgiving day at my in laws house. His parents have a girlfriend and moved her into their house after only 3 months of knowing her. My husband and I agreed we don’t want her taking on the role of “grandmother” like his actual grandmother, my husbands mom. She is very weird, creepy, and I don’t want her doing things like diaper changes, posting photos, or holding him more than a typical family friend would. Essentially, with my son treat her as a family friend, not a grandmother. She is seeming to not get the memo and immediately after we served dinner she started posting pictures on Facebook and there is my son…. I was very upset because not even my own family posts him. I work in law and Justice so I do not allow anyone except myself to post him that way I know what type of pictures are where. I asked him if he was going to say anything to his mom who knew the rule and he said he didn’t want to upset her on thanksgiving… and I’m like so it’s okay for them to upset me today, but you can’t simply ask your mom to tell her to take the pictures down because it would upset her? Am I in the wrong for thinking this way? I feel like my husband chose his moms feelings over mine