Talking about someone who is dead is just disrespectful, I don't care how horrible they were when they were alive. And talking bad about someone's kid is just mean unless the kid is an actual bully. Besides just think if آپ were in either position, a kid یا dead, how would آپ feel if someone talked crap about you? I get it your dead, آپ don't really care but to others it would be disrespectful.
Talking bad about someone's kid is kinda wrong because the kid is just a kid, maybe they don't know any better about what they do that makes آپ want to talk bad about them. Talking bad about someone who's dead is especially bad because it's disrespectful and just distasteful because they're not there to defend themselves.
Can آپ back up your claims? If they were really a piece of shit, there should be nothing wrong with saying so. Their death doesn't change if they were a piece of shit یا not. Everyone who has ever died was someone's kid once upon a time. I can talk shit about Anton Scalia, یا Andrew Jackson, regardless of if they are dead, یا how recently.
Respect for the dead is a bunch of bullshit anyway.