Seeing Koreans who look down on China... It feels like nothing has changed since the Joseon Dynasty .txt

While the scale of the countries was never comparable to begin with,
setting that aside, they are developing incredibly fast.
Honestly, it feels like China has long since become a bigger competitor or threat than Japan.
But if you mention even a small advantage of China, or say there is something we should learn from them,
if there is even a tiny positive element regarding China in the post,
people automatically change the author's nationality to whatever they want and launch mindless criticism and sarcasm.
Seeing this, it really feels like there is absolutely no difference between them and the people from the Joseon Dynasty hundreds of years ago
who used to constantly cry "barbarians, barbarians."
What's even funnier is that those "barbarians" they look down on have grown this large, yet they still continue to ignore them..
The reactions are all uncreative and childish, just the same old repertoire (though I suppose it's inevitable since they aren't providing proper rebuttals, just mindless insults):
Labeling everyone as "Hwa-Jjang-Jo" (pro-China trolls)
The "I won't buy it" meme
The "Kill the Chinese" meme
Chinese sentences where they don't even know the meaning (I believe most are just templates about Tiananmen or something similar)
Claims that they are people who poop in the streets
Saying the author's nationality needs to be specified (even if they are a native Korean, they somehow become Chinese the moment they write a post)
I'm not saying China is unconditionally a good country.
I know perfectly well that there are certainly uncivilized aspects and plenty of reasons to dislike them.
At the same time, there are clearly things to learn and clear advantages, and above all, it is a country that is growing so much that we must acknowledge it and remain vigilant.
I just don't understand why they feel the need to do nothing but insult them, or why they react like that the moment the latter aspect is even slightly mentioned.
Why is it like this?
Is it because they haven't learned anything from history?
Or is it that the people leaving those comments looking down on China
are actually Chinese spies?
Trying to make us lower our guard by saying "they are nothing"?
I just thought of this while reading the post about BYD below.