It's easy to tell other countries to get over colonialism, but colonialism is a major issue in the modern history of China. That's why Hong Kong is a touchy issue, and why a lot of Chinese people will get pissed off if you tell them it's not part of China. It was taken from China in a war in which the British forced China to import opium. Just keep that in mind when you think about why Chinese people might react as they do.
The remaining descendants of French aristocratic families aren't trying to claim their rights stolen in that revolution.
There does come a point in time where past difficulties should be laid to rest.
These inhumane policies have been in place for centuries so after 3-4 decades of half-heartedly treating people as equals, "get over it" isn't going to fly.
Generally the victims decide when to move on, not the attackers.
We can have both truths; it can both be true that China suffered greatly under British colonialism, and also be true that China is committing dire human rights violations which, to the degree that they further a Han Chinese ethnostate, are fascist. Tibetans, Uighurs, and indeed the people of Hong Kong are suffering under China's policies.