I think I'll make a mess of expressing this - not very well, and really weak on politics generally: it could sound facile. But...
The Left, founded on a belief in social progress and a happy belief in humanity's relentless march towards betterment, has a degree of conviction in its own moral superiority that can frighten me. It seems to come with a built-in blindness to its own fallibility. And with this comes a dangerous confidence that can be used to justify the most egregious wrongs - including reworking language and reframing reality: "this is what we do, after all: we shape a New World For The Good Of The People". Communism. Trans ideology at the expense of women. Its complete denial of - or worse, a failure to see - its flaws is a key feature. It's "progressive", after all. And how can progress, by definition, be problematic?
Rightly or wrongly, I see somewhat less capacity for such dangerous deceit - the outward-facing kind, of voters, and self-deceit - in the Right. Isn't there are kind of additional layer of security in their C/conservative status? They look to preserve what is and what was, and we're in a society now in which there's a clear consensus on left and right that some, at least, of the most extreme examples of what was (voteless women, Section 28 etc.), are now unthinkable. I do worry this doesn't apply so much to racism - the Southport riots showed this bubbling undercurrent of racist fury... but, even then, my point is that this tendency was expressed more overtly than equivalent, fundamental, prejudices are expressed be by the Left. To the Right, political arguments for the removal or degradation of established rights tend to be more explicit: "Feminism has gone too far... We need a return to the values of the past... We'll protect women whether they want it or not!" Hitler's anti-semitism far more blatant than the complex spectrum of feelings, from the liberal to the intolerant - we know it's still out there - jumbled together in, for example, the pro-Palestinian marches.
So (perhaps extremely naively?), I sometimes think we're better protected from the more obvious risks of right-wing prejudice, by our awareness of how far we've come and what these changes mean to us, than we are against the Left's more insidious, and by definition less familiar, forays into "social progress" through experimental social engineering. These efforts can include - to a degree, will be driven by - the exact same prejudices (eg. the misogyny & homophobia of trans rights ideology)... but these prejudices are better hidden under the rainbow flag of progressivism than an open acknowledgement of past values as being in some way "better".
I worry that they're that much more marketable to an increasingly frustrated and disenfranchised voting public.
PS Fell behind on the thread writing that, so not aware of the more recent replies!