The two faced bullshit in the chapter was ridiculous. 'We weren't thinking clearly because trip was canceled?' Fuck off. The lot of them were no better than the two shits that started this ridiculousness. Gotta love that classic Japanese classroom hivemind mentality.
And don't even get me started on the teacher. The way she collapsed into herself after MC backed her into a corner into that bowed apology was satisfying, but nowhere near enough to forgive her behavior. She didn't even try to look into anything, didn't report what was going on to her superiors, and took the word of the first student she talked to at face value and immediately put the whole class on blast. I'd be asking for her resignation immediately, she's clearly not fit to be a teacher if she's that easily manipulated by her own students.