Vaush is either too ignorant or too arrogant to accept that the kind of person who regularly uses ethnic slurs doesn't really believe in class solidarity to begin with

You can't have a socialist society if people of colour are oppressed.

You can't have a socialist society if queer people are oppressed.

You can't have a socialist society if women are oppressed.

Racism was literally invented to prevent people sympathising with slaves.

As long as there's a group of people who lack the privileges others in society enjoy, they will be exploited as an underclass - overwhelmingly at their expense, but ALSO ultimately at the expense of the rest of society.

Racism has time and again been used to turn white people against the rest of the working class and even if they usually also suffer from that lack of solidarity, the hostility and abuse they express towards other ethnic groups isn't meaningless or irrelevant.