It is interesting as a debate point, though, isn't it? I suppose one might "not like horror movies" - or, y'know, insert whatever genre. But is it weird that people who don't like a Marvel movie are told to just back off if they don't like it. I've watched all the Star Wars movies, and not liked quite a few. Should I not try the next one in the hope that the quality improves?
Thing is, if I went down that path, I'd have missed out on Rogue One (which I rate) and The Mandalorian (which was a bucket o' fun). With Marvel - a lot of which is basically cloning the template of "WHANG! BANG! SAVED THE EARTH AGAIN!", I'd have missed out on WandaVision (and Guardians of the Galaxy) if I'd switched off at the twentieth repeat of Hulk's ennui shoehorned clumsily into a scene where CGI rent-a-baddies swarm around a big city protecting a planet buster.
Corralling any genre (but let's pick on Marvel, because it's on topic) behind "not for you, this" signage surely only plays into Scorsese's notion that they're "not cinema".
See also: 2000 AD. If I'd stopped at The Grudgefather etc.