I'm afraid I was guilty of this when younger. My parents had their faults, but I knew they loved me and tried to do their best, in their overprotective way. My friend, Lisa, wasn't so lucky. I couldn't understand why Lisa wished for her parents' deaths, even after she told me some of the things that happened to her because of their poor parenting. I would respond, "but they're your mom and dad, how could you say that?" Lisa would snort and tell me that I didn't know what I was talking about.
30 years later, I've grown up and know better to say anything to my less-fortunate friends, much less than complete strangers.