Much Leftist criticism might be summarized in the following sorts of statements:
White men were insufficiently Liberal while inventing Liberalism.
White men were insufficiently interested in women while laying the groundwork for what became feminism.
White men were excessively imperialistic prior to developing anti-imperialistic notions.
White men did not ban slavery fast enough while being the first large group in human history to do so.
There is an inherently sadomasochistic streak running particularly through self loathing white Leftists.