Why are rebels, people who flatter others, and anti-nationalists all so anti-intellectual?

Because they are insecure, cognitively mismatched. Their choices are failures because of their cultural background, so they sincerely make anti-Chinese statements and anti-intellectual remarks to boost their morale. Because the reality is that they are very unsuccessful. Inner failure, societal failure. Being a dog abroad and still facing discrimination from foreigners. Fabricating all kinds of lies, rumors, and false information just to numb themselves, similar to drug addiction. Selectively ignoring the real world, fantasizing and tarnishing every day, living and working incompetently and unsuccessfully, being scolded by bosses, discriminated against by foreigners, spat on—here’s a four-character idiom for you: "Shame on you!"