I've read through the entirety of The Walking Dead comics as they were still coming out, I've seen almost every MCU movie except for two. I'm capable of enjoying the content produced, but I'm also capable of saying "hey, this is garbage - I like it - but it's garbage that's objectively inferior."
It's all for the same reasons I condemn Game of Thrones. Nudity and violence does not make a story "adult" or "mature," it does the exact opposite. It's to sell to animalistic men who never grew out of their high school mentalities. I love the idea of Superman, an all-American boy scout who does what is right and good. The problem is when that's taken away from his character and they kill Superman, or turn him into a murderer. It's ridiculous. Superman is a power fantasy for little boys and to teach them right and wrong, and that's perfectly ok. If you like that, I don't have any issue. Those good elements don't need to be removed just to justify adults liking Superman, though. I love fairy tales, and those are obviously for children, but I hate Game of Thrones because it takes away everything that's good about fairy tales in order to appeal to adults.
This is mostly a ramble, but hopefully it gives you a better idea of my anger at comic books.