There is no left-leaning anymore, that is now just centrist. The far left has become the left and if you don't fully comply or get in line with their extremism you are indeed cast aside as nothing but a racist, bigot, alt-right, phobe, etc. And it's not just Era twitter, reddit, etc all are the same way.
I think there are 3 categories, the moderate left (wanting some limited social democrat reforms), the far left (wanting radical changes, up to the complete end of capitalism) and the "woke" left (mostly concerned by identity politics).
The strength of the woke left is how easily it produces militants (no need to convince people of complex economic theories be it by Marx or Keynes, just tell them to listen to their feeeelings, anyone from a minority can easily be convinced everything bad in their lives come from its oppression, and majority people feeling guilt about being treated better or liking to virtue signal join even more easily).
Then both the moderate left and far left compete for these militants.
The moderate left (especially its more centrist part) is very happy they exist, as they allow it to appear radical (and get support from leftier parts of the left) in occasions without doing any big socio-economic reform that may threaten their funding. Big corporations have also well understood that the stronger the woke left is the less they'll be threatened, it's why they push woke left points (also don't wonder why the countries were the social studies justifying the woke points are the most supported in universities are the ones where universities money mostly come from rich donors).
For the far left it's another question. Being more marginal, as average people tend to fear the big changes they advocate for (especially after all the communist regimes dramatic failures), the far left need this new blood, and see the woke crowd as people radical enough to eventually be converted to important socio-economical changes (which is only partly true, they do like identifying with radicals, but the only thing most do is adding some communist flag to their twitter avatar and expressing vague support, while they continue only being obsessed about extremely secundary cultural issues ; but at least for the radical left it's more people not supporting the moderates).
In the end everyone competing for its support (or at least trying not to piss the berserk "inclusivity" militants with their terrible cancellation power) give the impression all the left agrees with the woke left. But most people really invested in the left (politicians, syndicalists, etc...) don't really have big consideration for the woke crowd. Both the moderate and the radical left if they could chose their public would rather take working class people, sadly for them workers no longer believe the moderates will do anything for them, after having seen very centrist "left" in power, and also tend to be the first to be worried by big revolutionnary changes made in their name.
Then it's a slippery slope, as the more the left replace working class with woke left types as militants and by minorities in their discourse, the more it piss the working class and make it likely to support populist right and so be demonized by wokies.
I think it's the thing reseterians fail to grab that explain that Sanders may be happy getting endorsement from people like Rogan (even out of a simple desire to diversify his public). Being a true socialist Bernie is certainly conscious the woke left is more a plot that succeeded to make the left lose focus on socio-economic questions than something really positive for the left, but he just can't say that as like everyone he had to rely on the wokies to form the core of his militant force.