How specifically would a Chinese person report taboo speech of another Chinese national from abroad? Is there a hotline or a website or something? Or do you jus

How specifically would a Chinese person report taboo speech of another Chinese national from abroad? Is there a hotline or a website or something? Or do you just call any government agency and tell them you want to report bad speech by someone abroad? This seems like something that the US and other countries should be legislating against, instead of leaving it up to schools to deal with.