To be clear - I think intersectionality is vital, I think awareness of privilege and balances of power when talking about the needs of different people is massively important. These things have value.
But it also seems to me that one reason the Left is struggling against the populist Right is that this expectation that everyone who doesn't get everything about the things I mentioned above exactly 'right' the very first time they encounter them or every time they mention them in company is a total pariah, a 'bigot', is 'erasing' or 'silencing' another group with what they do or say etc. When they're trying to the right thing but have maybe got it wrong, they're basically treated link c*nts.
People are well intentioned, but not everyone has a degree in sociology or whatever and not everyone, especially if they haven't had a privileged education, has a nuanced understanding of every political and social issue. Often one encounters people who are quick to label anyone who they see as less left-wing than them as 'fascist' (I was called this for discussing exactly the issue I am raising here on a LW group, though TBF, the guy was a bit of a out-there weirdo and was called out by lots of other people for saying it!)
I imagine one doesn't often see people chucked out of right wing groups for being 'not right wing enough' or 'not intersectional'. These groups, while lacking in self-awareness usually, are at least welcoming to all parties that want to join on the whole and won't chuck them out for 'saying the wrong thing'. Basically, it's easy to be part of the Right. It's hard to be part of the Left.
And that in part is because there is more self-awareness and care about it on the Left and that is valuable, but God, can't people sometimes cut people a bit of a slack?! It just seems that the Left spends its time tearing itself apart to prove who is the most pure and virtuous, and while it does this RW is making all sorts of gains in the popular consciousness and screwing up the world.