AIO: upsetting encounter with grocery store employee

I (33/F) went to the grocery store today with my 1.5 year old. I had to go to customer service because I was buying a patio set, and I was keeping the baby busy by playing with toys and being silly. Not trying to bring attention or do anything that would upset anyone around me. An employee walked up and said, “oh she’s so cute, is she your grandchild?” No I don’t do Botox, maybe I should…I never thought about it before, but this lady has brought my self esteem down lower than it already was. AIO for getting so upset about this? I want to crawl under a rock.