Proust and the Jews Part 2

The most unpalatable anti-Semitism turns up in Proust's The Guermantes Way at Mme de Villeparisis's (?) salon, when Mme Guermantes visits; most of the anti-Semitic vitriol is at the expense of Marcel's (former?) friend, Bloch, a Jewish young man who is becoming established as a leading writer or dramatist. Why is Proust so awful at Bloch's expense - critical of his appearance (even going at the old canard about Jewish noses), his blundering manners, his clumsiness, his social awkwardness. He even writes a paragraph about what people notice when a Jew walks into the room. Oh? This is something they can detect right away? (Yes, there is such a thing as Jewdar - but not necessarily in French salons.) I'm trying to find a way to excuse this hatefulness, and the best I can come up with is: Proust is pretty nasty to lots of characters, not Jews only (true), Proust is not nasty to all Jews, e.g.,  Swann (some of my best friends are Jewish....), Proust is accurately conveying the sentiments of the day (maybe true, but he feels free to skewer the received ideas of his society - but not this time). These don't meet the test. I'm left thinking that Proust - was he half-Jewish? - was another self-loathing Jew, and that his own Jewishness was something to hide behind a mask of art and artifice, similar to his own homosexuality. These sorrowful observations don't make me hate the novel or the novelist - in fact, they make me pity Proust, in a way - but they're a rough passage for contemporary readers to navigate, especially from this side of the 20th century, thinking about how easily even socially and artistically sophisticated European Jews were tossed aside like trash, and not in Germany only. Would Bloch have survived under Petain? Would Swann? Would Proust?