What you describe is a teacher getting arrested for clapping. Yes, they got arrested after being asked not to clap. But they were arrested for clapping. The clapping was characterized as disorderly conduct. But they were arrested for clapping. Clapping, five times, in polite agreement with a speaker at a town hall.

Notably, the crowd was told not to clap during people's speech; the teacher clapped after a speech ended.

There is no lie. The crowd was upset and voicing their displeasure. The police responded to protected speech, at a venue intended for public commentary, by forceful removal. If that isn't an arrest due to opposing the government's proposal, I don't know what is.