AITAH rules for one rules for all

I asked a close friend if I was able to post a photo of her child and me on my Instagram, she politely declined and I thought fair enough that’s your view your boundary and as your friend ill obey to that.. but recently I’ve noticed another friend is posting photos on their story of the same friends child and I just think am I being mean if I bring it up or say something or am I advocating for a friends boundary because it upsets me if she feels as though she’s powerless what can I do