I think leaving en masse from a lecture/speech that you ideologically disagree with is likely one of the few permissible forms of protest in a university context.
> Some Chinese international students at universities in the U.S. and Canada have reported anti-Beijing speech to university authorities as a form of anti-Chinese racism, or they reported Uyghurs and Chinese dissidents on campus to Chinese diplomatic officials.
Can you have freedom of speach while trying to take it away from others?