It's just the usual struggle about which part of society gets to wield the Shame-Bat - the ultimate weapon of social power. You make people feel shame, you make them weaker and powerless, but above all undeserving of justice.
When I was young, conservatives (particularly christians) had the Shame-Bat and used it to beat down on anyone who was gay, ethnic minority or inappropriately female. But, fundamentally, our society is still mostly opposed to making people feel shame about things outside their control (though there is debate about what is, and isn't under control). Gradually, the politically correct movement worked hard to eliminate those factors in our society that tried to inflict shame on people for the nature of their birth.
So the Shame-Bat passed to those who used it to beat on people who were racist, sexist or sexualist. Which is absolutely fair, as these things are not accidents of birth but bad habits which can be controlled. See how people feel about being called racist, sexist or homophobic these days - they're obviously powerful labels of shame and quite appropriately so.
But then, as always happens, the people with the Shame-Bat started getting indiscriminate. They started attaching those entirely deserving shame labels to accidents of birth - men were all sexist, white people were all racist, straight people were all homophobic. The people who enjoy waving the Shame-Bat are all fundamentally the same, regardless of the ideals that they claim. Because they were unopposed (no-one could convince them that they were no different to those who said women were all weak, black people all criminal, gay people all perverts) they continued to escalate. Feminists are all TERFs, Cis people are all transphobic, Jews are all zionist-fascists.
And so, gradually, people have become tired of being beaten with the Shame-Bat when they feel they don't deserve it. They stop flinching, they stop surrendering, they stop feeling shame at the labels. They develop a numbness to the beatings, and therefore a numbness to all the genuine shame-labels as well. They appropriate the methods that were first used to give the Shame wielders power (identity politics becomes white nationalism, democracy becomes populism, post-modernism becomes post-truth) and make a grab for the Shame-Bat themselves.
To a sociology student, it's all rather fascinating.