I love Jellyfin. I did think these recommendations were a bit funny however since they were so off.
Maybe the recommendations need to also look at the movies mpaa rating? Like something PG shouldn't be recommended after watching an R and especially not vice versa.
I guess it becomes complex quickly if you want to add other rating systems to the mix.
Fun fact about A Boy and His Dog: it's one of the primary influences (actually probably THE primary influence) of the Fallout games and their setting. In that sense, much of it is a criticism of Cold War American culture. All of the horrible stuff done to women in that movie is not an endorsement of it, but more of a direct criticism of the underlying misogyny in American culture. Also, it's based on a Harlan Ellison novella. Or collection of them, rather.
Totally, I saw the fallout show and decided to re-watch a boy and his dog.