Disproving the genocide thing is really easy: "How is it a genocide if nobody died?"
Ask them for a death toll. They will be unable to find one. Then they will say it is a cultural genocide, tell them that the term doesn't have a legal basis (you cannot prove or deny it). If they continue pushing the cultural genocide point, lightly remind them of the Global North's historic heritage.
They will then say that China is mistreating its uyghur population because they are muslim. Tell them that there are multiple Islamic ethnic minority groups in China (The Hui people for example). Bring up the ETIM and the World Uyghur Congress which allies itself with the Zionist State. You can also bring up the Arab League's response. If they say that all those nations are bought out by China, feel free to call them a racist piece of shit because the conversation is over and there's nothing you can do to convince them (would you try convincing someone who believed vaccines cause autism?)
Actual sources (disregard any vox, vice news, fox, bbc western garbage, nor should you bombard them with links and articles)
- Official UN report, no other source or news article/video should be used besides this: https://www.ohchr.org/sites/default/files/documents/countries/2022-08-31/22-08-31-final-assesment.pdf
- China's response: https://www.ohchr.org/sites/default/files/documents/countries/2022-08-31/ANNEX_A.pdf
TL;DR: UN said that the conditions of the strike hard campaign had led to instances of human rights violations, many of them very much China's responsibility to prevent. China says it was doing it to reduce extremism and gives context for why the campaign happened. Cut to 3 years later, Xinjiang is a visa-free tourist destination with more mosques per muslim than the number of churches per christians in England.
The strike hard campaign ended. The West's own "strike hard" campaign they named "the war on terror" has never ended and still destroys millions of lives to this day.