I'm just going to take this as a statement that you don't believe leftists should work with us to oppose white supremacy and you've come up with the most absurd and childish possible excuse to explain why.
I don't see how you would come to that conclusion unless you were trying to smear people on the left. Cooperation between leftists and liberals is necessary to overpower the right, but this cooperation can't happen unless liberals are willing to concede some matters of policy. For decades, liberals have asked leftists to give up
everything, to abandon their anti-capitalist and pacifistic convictions just because the Republicans are worse. We lined up behind Mondale, Dukakis, Clinton, and Kerry yet our political system continued to slide to the right. While Obama rode to office on a progressive platform and made some serious political accomplishments, the Democrats were unable to secure any political power outside the White House and allowed the most horrifying aspects of the Republican party to take control of almost state and local government.
The American left has been surging since the start of this decade, and this has greatly altered the political landscape of the Democratic constituency. Political attitudes, especially among young people, have shifted to the left. But this change hasn't been reflected in the broader Democratic ideology. For cooperation to happen, the centrist Democrats which dominate the party apparatus and control the purse-strings will need to actually respond to the policy concerns of leftists. If they don't do this, the Republicans will continue to have a lock on power.
For cooperation to happen, liberals will need to stop bashing people on their left. Prominent Democrats need to stop accusing their critics of being Russian agents or secret conservatives and need to bring to the table progressive causes like single-payer healthcare, a higher minimum wage, and anti-imperialism. This isn't petulence. This basic coalition-building.