Rin, this was your doing! Encourage her, please!
Also, while Takami and Fuji were definitely acting like dicks, I don't think they were intentionally trying to make Hatocchi feel bad or bully her. To them, it's just another concert, but it's Hatocchi's first ever, and they should've thought about that and encouraged her instead of just laughing at the dumb cicada stuff, and their laughter made her feel worse than either of them actually realize. They just need to get their heads out of their asses at some point if they wanna redeem themselves.