From all the concern trolling I see in the other instances it's clear that there's no winning over these people. Everything is "Kremlin propaganda" to them. I do think a lot of chapos did go a little overboard with the PPB, but even thoughtful responses were met with the "hateful rhetoric" and "Kremlin talking points" BS. As always, it is to the Global South we must look to for any hope in the future...
Here, show libs videos from this channel: https://vid.puffyan.us/channel/UCzDE2LGSmJnw53WrZ7mM_Aw (Living in China).
They're much more likely to be receptive to Westerners who actually live in China, rather than native Chinese (racism, unfortunately, runs deep) on the grounds that 1.4 billion people are somehow spies and unanimously a monolith pulling the greatest conspiratorial ruse in world history whose level of planning and labor to pull it off reaches heights far beyond anything the liberals themselves could possibly conceive.
A couple funny/good videos I like (since you mentioned BBC) are these two here: Western Media's Baseless Xinjiang Claims 外媒的涉疆谎言 Xinjiang Cotton 🇨🇳 Unseen China, and The BBC has EXPOSED my CCP Funding...🇨🇳 BBC曝光我们被北京资助？Unseen China
There's so many videos of tangible, visual examples of Chinese infrastructure, and some compared to the US. These videos, more often than not, will shatter these people's worldview and flip it over in real-time, softening their shields and making them more receptive to what you have to say.
I encourage you to dig deep through the channel's history, as there's almost always a video I can find that's relevant to whatever topic(s) the conversation has engaged with. Best of luck in the field.