Maybe it is like some han-jin complex
This history is trying to be rewritten by the current regime
Okay so the thing we have to remember is, the stupidity of Viet nationalists goes back further than this regime and can be seen before the Vietnam war, or even before the french.
VN broke off at the start of the Song dynasty more than 1000 years ago. Between then and now, the warlords who ruled Vietnam justified it by using the Chinese imperial title Huangdi (Hoang De in VN) when talking to their own people, but the lower title of a vassal king (wang) when dealing with China. They have always deceived their own people that "be proud that we live in a great empire". But according to Vietnamese military records, the rulers did not prepare defences on the China border unlike their other borders, which means they knew that China was not interested in them.
all Viets called China "the north" while some viet rulers called VN Middle Kingdom Zhong Guo (vn: Trung Quoc). These rulers called viets 'Han' 漢 (as if to say, the
real Han Chinese) while calling China whatever the current dynasty name. for example, when they declared war on the Ming dynasty, they went further and called the Ming as Wu 呉, the name of the Ming when they started out as a provincial warlord, implying that the Ming is
not really China.
Although they don't claim to be China any more because that's too ridiculous, every ruler has used this double dealing approach to make the people feel important while having peace with China. it's now part of their culture after 1000 years. This is the problem when you have a country that is at least half Chinese by blood and culture. it's like that evil sibling who sues their siblings for more inheritance. also, if we let Taiwan carry on this is what's going to happen.
Whenever I discuss about Southeast Asian geopolitics I always pretend VN doesn't exist because their mental problem is too deeply embedded. like for the Kunming-Singapore railway, just bypass VN. China should not invest in them because I know that they're not grateful at all, they just say that China wants to take over them. in fact if we pretend they are invisible, it's likely to make them less hostile because they cannot claim that China wants to take over.
Most northern Vietnamese have Han Chinese DNA in them while in the southern where they are more mixed with the Southeast Asian and Pacific islanders cultures.
from what I understand, only the Viets minority nationalities like cham, Khmer or highland people are not Chinese. the majority nationality (Kinh), north and south, clearly have typical Chinese surnames. remember that the Kinh only started colonising south vietnam around the 1500s and conquered the modern Saigon area from Cambodia around 1700s, they hate the locals and the locals hate them so they dont have enough generations to mingle. but that's a bad thing, because the cham and khmer tend to be more friendly to Chinese.