Name criticism

I went to the store for my fiance last night and one of the employees started talking to me about my daughter. Asked me when im due and what im gonna name her. When i told him her name Lianna another employee yelled "no don't name her that if she's fat. She's gonna be fat you should name her something else" (he said a boys name but i forgot what name he said). I wanted to flip out but it hurt my feelings so bad but i couldn't say anything i just paid and left didn't even grab my change. I am a big girl and have dealt with a**holes like that my whole life but I just expected once people become adults they learn better and mature. I honestly don't ever wanna go back to their store i would rather spend a extra 15 or 20 minutes to walk to a different less rude store than be humiliated like that again!