Working class people see wages declining in real terms, services overstretched, precarious housing etc.. But the mainstream left fights shy of talking about the root cause of those very real problems i.e. capitalism. Because it's been colonised by people whose interests are served by the status quo i.e. middle-class careerists. (Often their only claim to being of the left is the conflation of that term with liberalism, which we've seen on this thread.)
Which leaves a space for the right to position themselves as the ones who care/have the answers. The owners of capital laughing whilst workers turn on each other, fighting for scraps. Helped by the useful idiots of an increasingly popular strain IDPol whose aspirations for justice amount to how those scraps are divided, rather than questioning why workers aren't at the table.
We can sneer at ignorant proles ignoring facts and experts, but the reality is these politics are often born more of desperation than anything else. Whilst there's a small hardcore of committed fascists, the majority of people who are increasingly sharing this stuff on social media aren't (they've been exploited and duped by them). Largely, they just want to push back against the liberals who've done fuck all but abandon or patronise them.
The answer must be for workers to organise to build solidarity and win back the left from the bottom up.