Well, socialists believe that the problem isn't that white guys are white, but that white guys enjoy a position of privilege globally thanks to the two-headed demon of imperialism and capitalism that continues to dominate the world at the behest of a mostly-white and mostly-male ruling class. A central Marxist attitude is that all matters of social oppression have their roots in material (class-based inequality). Some liberals misunderstand this and believe that Marxists don't care about racism or sexism, but this could hardly be further from the truth. Marxists identify sexism and racism as products of our economic system which in turn help perpetuate this system.
This attitude has been vindicated by recent historical research into the emergence of patriarchy and white supremacy. Shockingly, race did not create racism. Instead, our racial conceptions
directly emerged out of a system of economic inequality that subordinated black and brown people under white people. The colonists who declared the Americas to be theirs happened to be white. To preserve their new property and justify the brutal violence necessary to protect it, these white colonists established the system of white supremacy. This hierarchy, which took centuries to evolve into our current racial understanding, is a product of colonialism. In turn, it helped defend colonialism, by poor whites to ally with the planter elite rather than considering black slaves and subjugated Native Americans as potential allies.
White supremacy in America is intrinsically tied to capitalism. Our economy was built on white supremacist values. The subjugation of black people was and is often manifest through economic means -- ensuring poverty through the destruction of black business, discriminatory hiring practices, or withholding government assistance. If black people were as rich and influential as white people, they could not so easily be oppressed. Similarly, the oppression of black people allows for our mostly-white ruling class to abuse black labor for menial work. Because many white workers are raised supporting white supremacist assumptions, racial divisions among the working class can be
very easily exploited to inhibit labor organizing or other forms of resistance to capitalism.
Broadly, socialists believe liberals don't go far enough. We don't only believe that liberal attitudes and tactics tend to be insufficient, but identify issues and systems that liberals rarely discuss. While most socialists agree with left-wing liberals 70% of the time, and often vote or campaign for liberal politicians, we don't tolerate many core liberal conceptions when push comes to shove.
