I'm sorry but if someone acted like that in front of my kid, I would be pissed, kids dont need to see bullshit like that. That lady is a low life for seeing that kid and still continuing to bitch.
I once got in an argument at a gas station with some lady because she was pissed that I pumped my gas then took my time in shop to grab a drink and she had to wait. She literally was screaming at me and swearing a ton. I gave it up pretty quick bc she was insane and as I drove off I noticed her like 3 year old kid in the truck, shit made me sick. people are fucked up, and that kid is going to grow up and be a crackhead