I can't believe the callousness and tactlessness of some people.
My examples pale into insignificance. I'm an older parent and was shopping with DD (probably about 2 years ago). Woman in the shop said something to me about taking my grandchild out. I said, "Oh no, I'm her mother".
Woman in shop, "Are you sure?"
Me "Yes, I was there whilst she was being delivered"
Woman "Well, I mean, you can't tell. Women have babies so young now.."
????
There was also the person I used to correspond with who was having some personal issues of her own. She'd visited me a few times and met my parents. I wrote to tell her my Dad had died. I got a letter back that said, "Sorry about your Dad. I'm still having a lot of problems but I can't tell you about them...." the letter went on about her for a bit and ended with "If you don't want to keep in touch, don't worry about writing back" So I didn't.
I worked with a horrible woman. She told my colleague that 'if wasn't for your awful skin, you'd be quite pretty'
And there was also the midwife, who checked on my friend two hours after she'd given birth, and said, "Well, you've got a lot of weight to lose!"