The statement "It's class, not race!" has been perverted, and is now used as a weapon against Black people. It's used to harm Black folk by minimizing the effects of racism, and pretending that growing up poor and white is an equal disadvantage to growing up poor and Black. It has become an anti-Black statement.
But it was originally popularized to help Black folk. To show poor white folk that had bought into racism, that poor Black folk are not their enemies.