The right, at least the far right, have always been hostile towards the left. That's not new and is unlikely to ever change.
Big picture stuff: For every action there's usually an opposing reaction. And secondly, change takes time and can be very hard for some.
In other words, the more progressive policies come into effect, the more energized and thus, vocal the opposition becomes. And after significant changes come into effect, the more likely there'll be some kind of fatigue or pushback to more changes.
In most democratic countries, this is best seen by the usual alternating between electing conservative parties and more leftist parties. But in recent years, those concepts can be illustrated by the Obama presidency and the turnaround on gay rights. The huge resurgence in specifically the extreme far right, including the subsequent Trump presidency in the States was the direct result of a black man becoming president. It just broke some (racist) people. The current increase in discrimination against trans people stems from variety of things, like them being one of the last remaining groups that can openly be discriminated against without any real consequence (
the other being Muslims) but no small part of that was the acceptance of same-sex marriages and what not.
It's the reason why when Trump says things like "you're losing your country", it strongly resonates with a certain group of people.
But the real issue are the cowardly and labile centrists that essentially go with the wind. The ones who'll readily abandon any sense of morality or principles the second their own interests are mildly threatened. See the intense backlash against any sort of criticism towards Biden while he actively enables a genocide. Or the the reemergence of that manifest destiny mentality from usually white quote unquote liberals blaming minorities for not being willing to vote for a guy that's supplied the bombs and weapons that killed their own families and loved ones.
