Check out the Harapeko Oyako to Motokare Yanushi discussions, and you'll quickly figure it out. It was a really deserved ban.
Why is that comment section a battle between misogynists and misandrists lol. I spent WAAAY too much time reading that, but yeah I can see why he got banned, arguing intensely with other people is against the rules. Also the dude seems like a simp, and the woman seems like a goofy lil goober that forgot that ghosting people wasn't nice, but hey I never even read the first page of that manga so what do I know.