Yeah. The first hour or so is literally everyone and everything beating up on Arthur. The youtuber 'Filmento' pointed out how a lot of films use the 'save the kitten' trope to get us to see someone as good but Joker used 'kick the puppy' trope to make us feel bad for Arthur. Hence why when he shoots those wallstreet brats most of us aren't horrified by him being a psychopath, but are instead on his side - even if we think he overdid it. Because we just spend the last hour watching the film shit on Arthur relentlessly in every scene, so we felt less like 'WTF ARE YOU DOING' and more like 'FINALLY HE REACTED AND STOOD UP FOR HIMSELF!'
Arthur is also a very 'reactive' character instead of an active one. Like, Travis learns where he can buy weapons and then makes the decision to go buy said weapons and plan to use them like a sociopath. Arthur, on the otherhand, gets literally handed a gun by someone, then gets fired because of said gun & blamed by the dude who sold him the gun, and then is forced into a situation where he's getting his ass kicked and needs to defend himself.
Plus, Travis is just some anti-social weirdo we get to observe. We're never really put in a position where the film goes 'See he does this because of X', instead all we see is him 'do X' without an explanation as to why half the time. Arthur, though, is some downtrodden mentally ill loser we're meant to feel sorry for and observe.
Also, both films decided to shoot the entire film from their protagonists perspective except for one scene. In Taxi Driver that scene not from Travis' perspective is one between Jodi Foster and Harvey Keitel to expand our understanding of their relationship. In Joker the one scene is Bruce Wayne's parents getting iced, because Batman.
I mean, TAXI DRIVER isn't the most complicated film to figure out or analyze, but you do have to do your own work and pay attention - maybe watch it a few times to understand it fully. JOKER is watered-down scorcese for the comicbookfilm-obsessed masses where every message is directly explained by one of the characters in the movie w/o a hint of subtext. I get why people like it, but chuds like EFAP crew mainly like it because of the culture war/it upsets the 'right people'.
Also, this reminds me of the Jenny Nicholson response where she mentions how the film was kind of over-the-top in how cruel it was to Arthur specifically (she's not wrong) and the spergboys spent like 30 minutes discussing FBI crime statistics and how sheltered she is.