None of us support Trump, just as none of us support Putin. But there is a sort of overcompensation in reaction to naieve and simplistic liberal narratives that might make it seem like we do.
Leftists get frustrated with the worldview that imagines, to steal a phrase, that Trump is Voldemort and Biden is Harry Potter. Anti-capitalists oppose the Bourgeoisie and Trump and Biden are both in service to them. It isn’t even simply that they are both capitalists - they are both neoliberals, who enthusiastically pursue the goals of neoliberalism - the transfer of wealth and power from the working class to the bourgeoisie, the enforcement of Western imperialism on a global scale, the withering away of society through austerity and privatisation, etc.
Of course it’s fine to support the democrats with the aim of harm minimisation. But liberals are wilfully blind to the fact that the system itself is not ‘rotten’ but rather functioning as intended, and that the scale of change required to have any hope of addressing climate change, wealth inequality, the descent into fascism and so on, cannot come from within liberal ideology at all let alone from the democrat party.
Trump is kind of funny too in the way that he infuriates liberals by openly unveiling reality. For example, no-one cared when Obama was putting children in concentration camps, because it was hidden away behind a bunch of shiny rhetoric about hope and change. But when Trump does the same thing and celebrates it, when he brings the racism and inhumanity of the US state into the light and declares fuck those kids, liberals are forced to see the true nature of their beloved country which their ideological fantasies would usually repress. The blatant hypocrisy of their rage is, from the perspective of cynical leftists, both amusing and bewildering.