You may argue that drug users should not be incarcerated or that there's bias in finding such users, but this unfortunately happens in most of the world and in China.
You or your children can end up in the camps for praying in Xinjiang, it's not exactly the same thing.
What is ridiculous is that China is vigurously criticised in every news outlet in the West on every occasion, while the French gov't gets away with almost everything. Can you explain that?
Are our prisons meaningfully different from "reeducation camps"? Are they any less biased, brutal, or damaging?
You can argue that prisoners in the US are "criminals", but states can call whoever they want a criminal.