What's the problem with Chouko being one dimensional and unlikable?
She's unlikable. It wouldn't make sense if she was actually justified in any of her thoughts, ways, or habits. Her trait is that nobody can like her. Personally I find her funny, but this is a character whose tragic backstory is "I have always desperately wanted to fuck girls, and it got so bad I imagined a girl I could fuck and commit depraved sexual acts upon". She's whiny, she goes on weird nerdy rants, and she's too obsessed with sex. She might be considered funny, but overall she's not necessarily designed to be someone people will like.
Also, spoilers for the next chapter Chouko is the reason the harem stays operational despite Setsu throwing a wrench into the works. She picks the "chaos route" and doesn't care who does or doesn't mess around with her girlfriend, much to the elation of Kinu and Kirara.