He yelled at her in the store

Yesterday my boyfriend & I went to the store with our daughter for dinner. She was standing on the back of the cart while we’d were looking at the food. The cart went a little bit in the air because of her standing on it but it didn’t tip over & my boyfriend yelled at her so loud in the store everyone turned around & looked. I was so embarrassed & angry at him because I never yell at her especially in the store. She ran up to me upset I comforted her & told him that he shouldn’t have done that. It was wrong of him. He doesn’t see it as being wrong. I told him that’s trashy. He did it a few months ago in Walmart & I told him not to do it again. He’s mad at me & called me a bad mom because I told him not to yell at her then proceeded to say in a narcissistic tone that I wanted her to get hurt from the shopping cart I said no I don’t, you don’t have to yell at her you could’ve just told her to get off the cart. He then said this relationship is retarded. I said yeah it is. We had an agreement to never yell at her & to break the cycle when we became parents. He just doesn’t care anymore.