Well, uhm.. you do realize people get invested in stores? And when you read a book or a story you get the right to express your dissatisfaction with a character? Oh.. maybe you're a newbie, or do you like this abusive character so much that would defend them anywhere? Or could be.. you simply lack intellect?
There's nothing complex to discuss here? He is a abusive bastard. Everyone's resentment toward him is totally valid. If you're so sick and tired of seeing the same shit then don't visit the comment section. You read the manhwa and go about your day. It is not others responsibility to maintain what YOU like.
If you don’t like Matthias or the story/plot, go read something else. No one is forcing you to read the story. Don’t come here complaining after you deliberately took it upon yourself to read the novel/webtoon. Save yourself the stress and anxiety and walk away. This is not for the weak minded. Walk away before your peace and happiness is more important.