I’d have opened my mouth and put that bank teller on blast. I’d have made her so ashamed of herself, she’d need to run to her “safe space” to pet a few puppies.
When you allow people to shame YOU, then shame on you for allowing it to happen.
You should have said: “I hope you don’t have male children who might one day make the mistake of dating a freshman when they’re seniors cuz you might wanna get up and move away from your own kid like you just did to me. But I’m sure you’re a feminist who claims she doesn’t need a man. Yet you went and got one. How cute.”