I thought this quote from this article was very revealing:
www.thetimes.co.uk/edition/news/pride-prejudice-and-a-problem-that-struck-at-corbyns-core-mwjpl36s9
Andrew Murray, the trade unionist, said: “He is very empathetic, Jeremy, but he’s empathetic with the poor, the disadvantaged, the migrant, the marginalised . . . Happily, that is not the Jewish community in Britain today. He would have had massive empathy with the Jewish community in Britain in the 1930s and he would have been there at Cable Street, there’s no question. But, of course, the Jewish community today is relatively prosperous.
I don't think all people who describe themselves as socialists think this way, but some clearly do, (or Murray wouldn't believe this is some kind of defence), and they don't understand why its a problem.
According to this philosophy, equality is only for the little people, 'the most oppressed', ergo any group that is no longer in the category 'most oppressed' no longer deserves equality. Grant yourself the ability to define oppression, and you can restrict 'equality' to a very small group of people indeed. ("of course the Jewish community today is relatively prosperous" makes me want to vomit)
In practice its very difficult to see much difference between this and old fashioned Conservative noblesse oblige. Throw crumbs to people who aren't a threat, but maintain the status quo. Jeremy Corbyn's 'empathy' didn't extend so far that he questioned why in 2019 the leader of the Labour Party and so many of his allies were white man from privileged backgrounds.