Let's talk about the worst parents in South Park.
Butters' parents, Linda and Stephen, are probably first to come to mine, and I guess it makes sense. They constantly ground him for the stupidest reasons, and have even beaten him up for swearing at them and talking back on the phone (granted, this was Cartman pretending to be him, but it shows that they would do this if he did actually do it), but they still care about him, like when they thought he killed himself in Marjorine. But there's definitely worse parents. Kenny has the worst life out of anyone, as none of his friends remember his constant traumatic deaths, and even make fun of him for being poor sometimes, despite the fact that he saved the fate of the US and Canada, and everyone who died during the war in the movie. Also he's sacrificed himself for them before. At home his life isn't much better, as his parents are constantly drunk and take out their anger on their children and each other. Kenny only really cares about his siblings, mainly Karen. But his parents are definitely up there for the worst ones. Cartman's mom, Liane, used to be one of the worst due to constantly spoiling him and having tons of affairs, but both of those aspects of her personality have been toned down, especially the latter. Episodes like Human CentiPad and Part 1 of the Streaming Wars show this. Stan's dad, Randy, used to be kind of competent but he's now just an idiot. He seems to want the best for his family, but constantly does things they don't approve of, especially Sharon and Shelly, such as buying a Blockbuster in 2012, and fighting other dads at Stan's baseball games. While Kyle's mom Sheila usually means the best for him, her earlier ways to do this usually ended up making others suffer even if it wasn't her intention. Clyde's mom literally came back as a ghost to get mad at him for leaving the toilet seat up, which caused her to die. When Bebe started to hit puberty and caused the boys to start turning into apes, her mom taught her that she should rely on her looks and not learn any actual life skills. She didn't listen, but it's still a terrible thing to tell your daughter. The last people I think are notable are Tweek's parents, because TSOT reveals that they drug him, which causes him to be constantly paranoid and twitchy. Out of all of them, I think the worst are Kenny's. They're both unemployed and cause their children to have to live in welfare and constantly abuse each other.