The fully annotated and definitive list of movies that are:
1) Horribly violent or exploitative
2) Emotionally devastating or psychologically torturous
3) Offensive or Racist
4) Uncomfortably misogynistic
5) Have really horrible behind the scenes stuff
6) Directed by rapists/pedophiles/murderers
7) Gross as hell
8) Painfully bad
9) Weird to the point of causing discomfort
10) That I have seen myself*
Please kill me, compiling this list and remembering these movies is torture.
Sidenote: This is a list combining expected titles for a Feel Bad movie list (Salò, Pink Flamingos, A Serbian Film, etc), with classic titles of this sort (Häxan, Night of the Living Dead, Peeping Tom, etc), and unexpected personal picks (Beneath the Planet of the Apes, The Beast That Killed Women, Cat in the Hat, etc) to make a truly unique mix of titles.

*There will be exceptions made rarely for probably obvious reasons