See also: misogyny, sexual assault, transphobia, ableism, whorephobia, classism (which is ironic), and xenophobia. These alongside white supremacist delusion are all issues leftists must address within self as well as with community.
I will say that the anti-racist response in the UK is encouraging so there's that. But so many aspects of engaging with leftist spaces require you to check certain aspects of your humanity at the door--while telling you you don't have to do that. Needs improvement!