free trade's amazing, seriously!

Time was, mercantilist countries would use foreign colonies for resource extraction; and sell the goods manufactured with these resources back to them.

It was great for everyone!

To a degree, this is Australia in this case, no? Resources are extracted from Australia, exported to China, turned into high value goods and sold back to them. In this case, it's exactly what OP is happy about!

Yes, everyone is always telling me how great colonialism was for the locals.

...and then the "colonies" figured out how to weaponize it and turn the balance in their favor.

Or, not quite: the workers are being exploited just like they were during the colonial period. But at least now their rulers have power over our rulers that they didn't have before. So they get to be happy about that as they make novelty items out of toxic plastic for Temu.

Modern China is a vastly better place to live than China of 60+ years ago. Many countries are nicer places to live, but 1+ Billion people are simply better off making the “exploitation” narrative ridiculous.

Porque no los dos? Given the number of billionaires in China, it can both be true that workers are exploited, meaning they could earning more for less hours, and that the living conditions are better on average and possibly medianely than the local minima of 1966.