I've always maintained Sakurako's personality change in late primary, early middle school is mostly due to her family not respecting her. that said, the fact that her role model is Toshino Kyouko is a terrible sign. Also, as usual, they couldn't get much gayer, the tsundere couple, could they? Sakurako's immediate response to being insulted by her crush is to flirt with as many girls as possible, seeking validation. Great pattern. If YuruYuri wasn't comedy, it'd be cringe like Watamote.