If you publicly identify as a leftist, whether your are statist or anarchist, Marxist Leninist, socialist, communist, communalist, believe in electoralism, believe in violent struggle, or whichever mix of ideas and ideologies seems best to you; if that's what you represent your self as believing, you cannot support fascism.
Publicly supporting fascist-aligned regimes that just so happen to be opposed to US hegemony is asinine.
Supporting Putin's fascist regime in Russia is asinine.
Supporting the Ayatollah's Islamofascist regime in Iran is asinine.
Providing cover for the atrocities of fascist regimes by pretending every shred of evidence of them is a US psyop is asinine.
If your hatred of the US or US-led capitalism means more to you than than the suffering of the oppressed, than standing in solidarity with those struggling to throw off the yoke of their masters, you're no leftist, you're just a collaborator in the ongoing class war who wants to virtue signal. Supporting fascism makes even being a tankie look tame.