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For me, a bad movie is something that's just plain boring. A bad movie so stupid that it's hilarious is the best kind of comedy, so to me Troll 2 is not at all a bad movie, neither is any twilight (other than the third one, there was a couple of funny moments but the rest was just some angsty camping trip in the woods). So movies that I consider bad are probably like a 3-4/10 on someone else's scale.
The worst that comes to mind is the recent critically acclaimed horror western The Bone Tomahawk
It wasn't scary, didn't have an interesting consept and was so goddamn racist ,literally the only black character is killed off in the first ten minutes just so a POC character can say "They don't eat the n-words because they think they are poisonous". That line literally doesn't come into play at any point. It's just there. They don't kill any other black character (because that one liner character was the only one), none of the protagonists are black. Also the antagonists are cave-dwelling native americans & all main characters and heroes are white men + a white damsel in distress. Like I'm caucasian but even with my nazi-orgasm worthy blue eyes I can see that this shit is so fucking racist. Like don't get me wrong, it's supposed to be set in the wild west, but it's all pointless & blatant.
-SPOILERS FROM THIS POINT ON-
Also the movie is incredibly sexist. Like I get prostitutes and homey ladies when it's the wild west, but having some deep web creepypasta rape dolls is on a whole another level. And like with the racism, it's completely pointless, there is literally one two second shot of two heavily pregnant women lying on a table with their limbs cut off & wooden stakes hammered into their eyes. And, despite killing every single of the male tribe members, the protagonist just walks past them. Like out of every character I think we can agree that those two fucking deserved a mercy killing. But he just leaves them there like "lol I guess you'll dehydrate to death, bye"
THIS MOVIE WAS SO SHIT
(Another recent shitfest was We are still Here, but the repetition & how all story relevant lines were given to one side character was pretty funny & the ends explosions of blood and gore were pretty funny too)