China Dominates 44% of Visible Fishing Activity Worldwide

It's very hard to take your comment in good faith.

Societal expectations were very different back then. Should we also slam those trying to end modern slavery by mentioning slavers of the past?

Exactly

Nuance is required. Would you impose a 2 Sea Bass over 42cm limit per person on the residents of North Sentinel Island?

It’s all a spectrum. One nation cannot leapfrog the rest in its advancements then demand the rest follow its new norms, unless they’re willing to put their money where their mouth is.

How convenient. Getting on top of the mountain and pulling the ladder behind you. If rich countries were willing to really help those less fortunate (especially counties that they themselves looted in the past), this argument would have a lot more weight.

Is the rest of the world supposed to stay poor and desperate forever? Especially considering that rich countries still suck massive amounts of resources (and turn a blind eye to local corruption), and provide popular emigration destination for talented people who leave their homeland instead of helping develop it?

China is no longer a "poor country". And overfishing is harmful especially for poorer people who will be deprived of a relatively cheap source of food and export. Especially the smaller fishers. Somalia is probably the best example of this.

But no, the West has often been imperfect, no doubt about that, which is why these sort of restrictions and limitations were set up: to prevent repeating the mistakes of the past which hurt everyone. And yes, we probably should recognise more that the West got ahead partly in ways that harmed everyone. But none of that justifies what China is doing.

There’s zero nuance required for China, it’s a modern economy and should definitely be held to modern standards.

There’s more to a peoples than the economy

Not in this context.