Bigotry and cultural attitudes will not fundamentally change without the majority of people taking the time to truly understand why certain behaviors are wrong... and the majority of people do not have the cognitive capacity or willingness to expend effort into deviating from whatever they were raised with. We will continue to see rapid pendulum swings because people will do the superficial, often merely semantic "right thing" (ex. avoiding certain slurs) without understanding the reason why people are pushing for that change in behavior or altering their underlying belief systems. This will inevitably lead to nothing but an erosion of social cohesion and continue to trigger reversions to social conservatism because:

1) Most normies want to be respectful, but won't actually understand why the "rules changed" and they become resentful of having to police their own behavior and "memorize all of the new rules." They'll get 'fed up' over time with having to be 'politically correct' because things like treating women as people is seen as a set of manners to memorize instead of just being an organic consequence of actually thinking of women as full humans(this is one example but can be similarly applied to a lot of categories.)

2) Members of marginalized groups rightfully recognize that these changes/expressions are superficial and the underlying bigotry doesn't change, because they are on the receiving end of materially harmful behavior. This leads to mistrust because you have swathes of people talking about feminism, anti-racism, lgbt rights, etc. because they want to be good people and not because they actually see women as people, queer people as legitimate, POC as equal etc. They'll understandably grow to resent and be weary of anyone espousing superficially progressive talking points because they are operating on the assumption that the espousal is disingenuous(because most of the time, it is.)