He's definitely not normal, I would say he's a genuine douchebag compared to the normal population but comparatively as an IRL streamer he isn't burger planet or sjc levels of scumbag. Just things like being a nuisance while streaming, using people for content, disrespecting minimum wage workers etc. He can be pretty funny though, sometimes. I think the entertainment comes from him just not giving a fuck about societal norms.
Hyub admits to his girlfriend that he cheated on her, and refuses to turn off the stream when asked. This is probably the worst thing he's done, kind of comes off as a sociopath, it's obvious that he doesn't care about her at all and thinks it's funny. She's sitting there crying while sad classical music plays in the background, he's drinking her wine and chowing down on food while talking to his chat, donators playing meme songs, the girl he cheated with calling him live on air to grill him alongside his gf, cheersing her glass while she's on the phone, repeatedly manipulating her into staying on stream, then screaming her name into the dark, rainy streets of Tokyo when she leaves... There's something so surreal about this video that makes it feel like modern art.