If you don’t get the historical or political reason why something is the way it is then it seems “natural” by default. China never had a several millennia empire unless you think Europe is also a several millennia empire. The modern concept of Han is the same thing you’re doing when you say “fucking Saxons”. The Saxons didn’t do anything, the imperial system and opposition to it is racialized. From the 1600s-1900s Han wasn’t the dominant group in China, the Qing dynasty had a Manchu identity, and they executed people for expressing Han culture. Opposition to oppression and corruption and European imperial influence was racialized as Han nationalism.
CCP politics straddles an anti-colonial idea of Chinese identity where the diaspora of people shipped around European empires to build railroads or farm plantations are still Chinese, and then also a geographic identity that all those millennia of different systems whether Mongol or Manchu or Han or split up into 100 different states are all equally Chinese.