They definitely have a dark side these John Hughes films. Ferris is a bully, a liar and a cheat. A manipulative psychopath concerned only with his own enjoyment. People who are not 'self-actualised' in this way are marks to be used and abused.
Breakfast Club is the same. He accepts the hierarchies as natural and preordained. The nerd isn't allowed a girl. There isn't one provided. This scarce resource is mopped up by the alphas,
I enjoyed Ferris despite misgivings but Breakfast club is a lot uglier. It's immersed in the culture of narcissism and self-absorption. My shrink says I'm a brat because mummy and daddy never paid me enough attention.
Bender is me-too bait, sexual bullying and abuse throughout but gets the girl anyway. You've got the same thing in Ferris. Uptight girl is cured by a kiss with a bad boy. Again in Ferris it's fine cos Charlie Sheens character is played for laughs but Bender is a very unappealing character.