Oh so many as a bereaved parent.
One woman after my daughter died (she worked with my exdh) said "you were so lucky to have had her for 2 weeks, I won't even get that..." and started on about her infertility, literally days after dd died.
Another woman I vaguely know with a dd the same age as mine would have been stopped me in the street and said "every time I think of you I hug my dd a little bit tighter" and then proceeded to hug her dd in front of me.
After my son died my own mother (now nc) said "its ok for you, you're getting all the cards and attention because you're his mum, what do I get" 
She also said "On the plus side we don't have to buy X wash powder anymore" (ds got a rash with most of them)
She also told me I was embarrassing for seeing my friends when I was grieving and I should be at home 24/7. She also told me that I had "fucked up the only good thing I ever did in my life" and she would never forgive me for his death (he died of a medical condition).
My now exdh after our dd died said "she died because you're such a bitch, must be karma because who has 2 kids die on them"
And so many more.
Another time a random woman at the school said she loved my (long) hair I thanked her and she said "I just love my kids too much to have long hair" and then went on to explain the time I took with my hair would be better spent with my kids. I was so gobsmacked I didn't say a word, but she had very short bright red dyed hair, she must get her hair cut every couple of months and dyed every 6 weeks, I spend 10 seconds running a brush through mine, and haven't had it cut in a decade 😂