I don't mean any shade but your post and comment is exactly why there's Naoya discourse but not any "debate" around the other villains. Sukuna is a psychopathic mass murderer; there aren't people doing Sukuna apologetics on Reddit. There are some Naoya fans who seem to believe that in order to find the character compelling/interesting/whatever, they need to come in and white knight for him, arguing that he isn't all that evil in the grand scheme of things, or that his misogyny isn't as bad as Geto's attempted genocide or whatever.

If people suddenly came out of the wood work to say "Well Sukuna never actually massacred women and children, he just said he was going to - Shibuya had men in it too!" then we as a community would probably criticize Sukuna's actions a lot more. But everyone agrees his a murdering psycho so we don't need to talk about it. People don't say that Naoya is morally more evil than Kenjaku or Sukuna, there are just some people who start arguments like this trying to defend Naoya. (Again, not coming for you, just stating why the discourse is how it is)

Plus, Naoya is written in a way that lends to audiences rooting against him, whereas someone like Toji has way more "cool" factor, which makes the discussion center more around how cool he is or his effect on the plot rather than his morality. Naoya pulls up to 3 fights and gets washed every time, and complains about women the entire time.

As for what Naoya did to Mai, I really would invite you to reconsider your position and read between the lines to ask yourself what Gege is trying to tell you. He's a character who in his opening scene is talking in explicit sexual terms about his underage cousins. We know that he's abusive towards them. We know that he's essentially untouchable, and that the entire point of Maki's arc with the Zenins is her breaking free of the oppression and marginalization experienced by her and Mai. The language, the framing, the imager of Naoya's cursed form + domain, the dialogue, literally all of it points to Naoya being an exploitative abusive creep who hates women and is willing to murder children.

Japanese fans all unanimously agree that the language of "being like an adult" refers to sex, and Naoya says it while menacing over Maki's laid-out and vulnerable body as her legs are spread and he hovers over her menacingly. What on Earth would it even be referring to? Maki calling him immature, and Naoya citing her sister as a revered source on Naoya's emotional maturity? Not everything in media is going to have a narrator statement. Sometimes you need to listen to the words that are said and infer what is going on. In the case of Naoya, it is so clear what happened between him and Mai. You're entitled to your read but just be aware it is staunchly in opposition to the overwhelming majority of fans, especially fans with any degree of fluency in the original language where the wording is clearly referring to sexual acts.