I can't see a situation where outing out someone like that wouldn't be a really mean thing to do. Talk about your feelings all you want, but if you want to act, be more aggressive yourself. Low blow, really.
They're not some randos, after that exchange they still have to live together unless they decide to leave, so I think acting like that towards each other and making enemies is a really bad move. Plus it's on TV, so if many viewers feel like that too, it's a really silly move.
Haruka might be jumping between guys, but remember that it was Risako who was all 付き合おう to Ruka and then decided she's not interested in him after all.
Anyway, until this week's episode I really liked Risako, but after that exchange? Nah. That said, I guess we have to remember that most of them are still kids who probably never lived together with others in that kind of environment.
Kenny at this point is just annoying, maybe he's waiting for someone else who is more his type to FINALLY start moving?
As for Shohei's comment, it felt more like him trying to be cool than anything else. I'd go as far as to say that 100% of the drama in TH doesn't matter, especially compared to some murders etc. And yet it's people thinking and talking about their feelings, so to them it's important. Looking at Shohei in general, I definitely feel like the guy thinks he's much smarter than he really is.