Change my mind:

Historically, certain groups in the A.merican left have suppressed any criticism of the white working class in the name of unity. The New Deal was very white-centric, many unions in the US have a racist history

you seem very confident in this
Even if its true, isn't it also true that generally the reactionaries are winning today, in gaining the support of most of the white working class?

What are you talking about? Socialism and communism are at their strongest today since the fall of the eastern bloc, the popularity of the left and leftist ideas among the workers are have consistently been on the rise the last several years. The reemergence of a fascist movement and reactionary politics is just the backlash of the bourgeoisie working to counter the tide of working class radicalism.

If the left is weak in settler countries how come they won in Cuba and almost won in Chile?

socialism eco fascim nazism number one #1

revolutions can be successful in settler countries, but not reform
Chile failed because they went through the reformist route

Dying labor aristocracy of a settler-colonialist state. But whites are being actively proletarianized.

polls in any country outside the USA or any other such imperialist country show the opposite. Russia and former soviet states all have a majority support for leftist thought. that is ignoring the fact that 'white' is an arbitrary idpol definition that creates artificial division among humans.

Its meaningless to call them "white" since they don't live in imperialist countries then

eastern europe probably, most boomers in ex-com countries are leftists