Moms, what would you do?

I was at the park with my 3 year old daughter and she was holding a stuffed animal. A boy (maybe a few months younger than her) came up to her, snatched the stuffed animal, and pushed her. All his mom said was, “he’s not used to playing with girls. He has a brother that’s why he’s rough.” Like ????? She didn’t even tell him to say sorry. I didn’t even know what to say, I was so upset. I took my daughter and left.