Right wing morons and shills can't exactly base their arguments on how much better Republicans are, so they come at it sideways with this bullshit.
Well, jokes on them because "the left" isn't made up of complete morons like they have in the MAGA movement. Despite neoliberal whining to the contrary, the left has been consistently the most reliable voting demographic the Democrats have, and that's despite the fact that the establishment shits on us at every opportunity.
Keep in mind that most of them (like OP) are right wing agitators trying to drive a wedge.