Brother in laws girlfriend

Kristy
They bought some onsies and a pair of pj's for my baby for Christmas I smiled said how cute they all were and thanked them then like a week later my BIL said she was upset cuz i wasnt excited about the onsies im not sure how i should have acted when i opened the gift but it apparently wasnt good enough and now she posted on Facebook "what do you get someone for their baby shower when they are probably the least sentimental person you know" and tagged me in it. How would you feel about this or what would you do?