I read an article a while back showing something similar with adults in kid's shows, like the Disney shows that are so popular, can't think of any names off the top of my head. But they showed adults, and parents in particular, as monumentally stupid and incompetent and a constant point of ridicule, and they tied it to increases in acting out in school and claims of parents that they increasingly struggled to control their children. Eh, I'm messing it up, but the gist is that we tend to believe what we are constantly presented, whether it's true or not. Like Trump constantly presenting the stolen election statements that lead to Jan 6th. Say it enough and people will start to believe it.