Nuh-uh, Xi pressed the big red communism button and now all the capitalism is gone!

[is joke, obviously that’s not how it works]

“It’s just never worked” is ignorant though. Every nation that has tried to dump capitalism has has successes and failures, and there are many factors that contribute to each. Economies are extremely complex and you simply can’t say anything intelligent without getting at least a bit more in-depth than “works/doesn’t work”.