It's quite possible- they could have merged into the same film in my memory somewhat. I actually went into watching the Joker with no preconceptions or hearing anything about it and I was surprised as to how blatantly it was a mix of Taxi Driver and King of Comedy.

Isn't there a part where he goes into a bar with people doing some kind of open mic comedy or am I confusing it with someone else? Ethier way I don't really buy the idea that it's some kind of metaphor for the modern era. YouTubers who have a big audience are usually really talented in a niche field and that comes from hard work rather than being delusional guys sitting around their mum's house all day.