It became so socially unacceptable that its proponents won the US presidency and took control of Congress and globally famous business leaders are bending the knee to them without repercussion? What definition of "can absolutely" are you using?

It is less socially acceptable in some cultures, more in others.

The fact that a gradient exists is proof that, under different circumstances, the social acceptableness of hatred can change.

The popular vote does not determine what is right. The US elected an incredibly racist Richard Nixon by a Landslide in 1972, but that doesn't mean society couldn't make progress on making it unacceptable to use racial slurs in public.

I personally did not read the parent comment's saying of "can" as meaning "has been"

There is a danger to hating something so much, that it goes underground. A major reason why President Trump won the first time around was because hatred against Trump and his supporters was so strong, that many people being polled were afraid to tell the pollsters who they were really voting for, for fear of being destroyed. This is a major reason why Trump outperformed his polling.

In the meantime, when people are lied to by every avenue of culture, they are convinced everyone else believes in the lies, so they feel alone and in the minority, even though they may very well be in the majority. So long as this spell can be maintaned, the dictator can hold his grip on power.

But what happens when that spell was broken? When something happens, and all of the sudden, everyone realizes they've been in the majority all along? This is how dictatorships topple -- and the toppling can happen very swiftly, as Ceausescu discovered in Romania.

Elon Musk acquiring Twitter and taking out the censorship is what initially cracked the spell this time; and when Trump was elected not just by Electoral College, but by the Popular Vote, the spell was broken completely. It's why we're seeing so much change now, and why it's so rapid.

I intended to include something that I now see I forgot: this phenomenon is called a "preference cascade", and it's a big reason why we see dramatic shifts in power in oppressive regimes.