Because the concept itself is stupid. Dogs literally push a woman off a cliff. Cruella is clearly made to be sympathetic, and that you’re supposed to cheer for her. Which is ridiculous, because it’s Cruella. And who the fuck cares if she adopts the dogs and loves them or whatever, she’s going to end up trying to kill all their decendants to make into a coat in the end anyway. You say that’s not in the story, but it doesn’t have to be because we all know where this story goes. And if you say “well, THIS Cruella doesn’t hate Dalmatians or want to kill them”, then why make a Cruella movie in the first place?
Eirher make a movie about Cruella being an evil bitch that’s actually evil, or tell an original story about an antihero striking back against the world and woman that ruined her life. But Disney wants brand recognition and wants to get the Malificent crowd, so now we get stuff like “Roger decides to write the song as a TRIBUTE to Cruella after she gives Pongo to him as a puppy.” They wanted it both ways and the film premise and story are laughable as a result.
It’s fine if you like the movie or enjoy it, but don’t start insulting people for mocking it. Because “cgi Dalmatians pushed my mom off a cliff to kill her” is the dumbest most hilarious backstory for Cruella De Vill I think I’ve ever heard.