That's the flag of the Qing dynasty. They were the cause of the collapse of Imperial China and the effects of colonialism in China.

Yeah, of all the dynasties to use for a 'good past VS bad future' comparaison, the Qing dynasty is the worst dynasty to use as an exemple.

They were the one who kept China has a backward, isolationist country, unable to prevent western powers to bully it around and made it their bitch.

Hell, THEY are the reason we have communist China today. Because they were so incompetent, fucking Mao was considered an improvement over them.