This is crap and a lazy claim. In the US, for instance, fascist tactics from democrats appear to originate from neo-liberals (Clinton, Obama) rather than leftists (Warren, Sanders, Stein).
If you squint, you can see that capitalism and regulatory capture have always been core to fascism. Neither are leftist values at all.
If you're obliquely referring to, err, recent "PC" culture, that seems to share a lot more with puritan culture than a form of government.