By the way, talking with the TRUE and serious posters of this thread:
I don't see any "significant" parallelism with Taxi Driver, other than the mental issue (common with hundreds of movies out there anyway). I don't see any strict similitude between Arthur and Travis, and I've watched "Taxi Driver" at least 3 times. So I don't get why reviewers and critics keep throwing the name "Taxi Driver" in the middle just to make their reviews sound more interesting.
They are two vastly different characters with vastly different aspects, and each of them represents a different problematic world.
Said that, the style, the direction, the cinematography of the movies are also different.
Am I wrong?
I think the mention is that Joker supposedly feels like a mix of Taxi Driver meets King Of Comedy, and that there are elements from both in the movie, then again a lot of people have been saying that since day 1 this film was rumoured to being greenlit as Scorsese was attached and even though he wasn't in the end involved up to like 3 months before it came out people were still talking about Scorsese's involvement in the movie...people get shit stuck in their head and just cannot get it out I guess.
That said you are the only person I have seen claim this movie doesn't feel like it is inspired by Scorsese's work so yeah you are probably wrong.