Why is advocating learning from developed countries called a traitor?

Those who like Han Xing's European and American styles will also be described as worshipping foreign things and flattering foreign countries. In fact, we all know why we all like some foreign cultures and learn radially. Because we lack that feature, we need that element and the direction of development. As for those who want to learn from the strengths of Europe, America, Japan and South Korea and call themselves traitors, I am just a personal opinion, which I think is immature, naive and even wrong.