I don't know that they loathe themselves, rather, it appears to me they esteem themselves above all.
They believe they're smarter, wiser, and a better champion of the pore&starvin' *and oppressed* than anyone. At bottom, because they believe they are champions of the oppressed, they perversely absorb what they see as the oppression of others as a probable oppression of themselves as a minority, therefore, all "minorities" must be uplifted and ennobled, even at the expense of the majority culture and people.
It was American Jews who were behind the push for immigration reform in '65 and the flood thereafter of the turd-world into a majority White country, on the unspoken grounds that, ultimately, this would make them 'safer'.