Was anyone else annoyed/confused by that girl in the bar?
If I followed that right, she had feelings for Isechi, but wasn't able to act on them because Isechi kept falling for straight women. Now that Isechi's fallen for a lesbian, she's annoyed because she didn't get a chance.
The thing is, it's not like Isechi's psychic and automatically knew the sexuality of her crushes(?) in advance and did, infact, think Kaoru was straight up until she found out otherwise.
That all makes enough sense on it's own, but why are the other girls siding with her over Isechi?