Have I mentioned that I don't like Maki? Because I don't like Maki. Even if you leave aside possible yuri, that is not a good way to treat your friends.
compared to how Yokuo treated Maki just because she likes someone else. I am in the opposite camp TBH I would rather Maki be with someone else since Youko is so conflicted with herself.
It wasn't so much because maki liked someone else as it was the fact that the person she liked and defended (by marginalizing Yukou) regularly picked on her. In my opinion, that's a pretty reasonable stance.
"That guy you like, who you're always hanging out with, is a complete jerk to me, pretty much whenever I see him. He's actually gotten other people to call me names and insult me."
"No, you're wrong, he's actually really nice. You just need to stop minding the way he treats you."
"Yeah... I'm going to stop hanging out with you as long as you're with him and/or constantly talking him up. I don't really like being around people who make me feel less like an individual person and more like a stand-in for my sister."