Poster didn't say it's rampant, just that "it is very much alive."
I'm German, I live in Berlin, I regularly spend time in eastern Germany, outside Berlin. I can sadly confirm this.
During the cold war and after, the US and anglosphere was mostly interested in the destruction of left ideology, labor unions, left parties etc. were all targeted. The right offers a safe outlet for people with those grievances, it doesn't threaten capital, so it was always allowed to linger in Germany not just in the east. It's deeply rooted in establishment and civil organizations, in university fraternities (schlagende verbindungen, the CSU etc.). The allied supported and used and bolstered far right groups all around Europe (Gladio, NSU, etc.) in their fight against socialism and people on the left. We still feel the effects to this day and state and federal police and intelligence still operate this way.
Protests in Germany you see police protecting far right groups from leftists, not the other way around. It's a necessary aspect of liberalism to allow the disenfranchised the outlet into right wing extremism.
The enlightenment was less influential in the rural estates of the ultra conservative east elbian Junkernklasse than it was in the more densely populated Rhineland regions. Fukuyama has a nice chapter on the matter in “The Origins of Political Order”.
On top of that you have the separation, and the dislike of the GDR to foster critical thinking and the economic collapse of the east after reunification that lead to a lot of brain drain.
The grandparent (quoted above) is generalising a population as having these negative aspects and suggesting that support for the AfD is only due to these reasons. It is a form of shallow dismissal based on bigotry. It doesn't seek to understand the population and properly why support for the AfD is rising. It's much easier (for the bigot) to write off people as having entrenched negative characteristics.
And I wouldn't normally say this but if you have a browse through the grandparent's comment history, the majority of their comments are of this ilk, including one comment about 2 months back that they received a warning from dang for.
The right wing movements in Europe started around 2000 in Italy, Austria, the Netherlands and France. Germany was way behind.
In Germany the AfD won voters after Merkel let in too many refugees in 2015 against the will of many CDU voters.
The AfD is probably less extreme than MAGA and most European counterparts, including Scandinavian ones. But it is always easy to pile on Germany, isn't it?
(I don't vote for them, don't like them, but this is getting silly.)
https://en.wikipedia.org/wiki/1990_German_federal_election
No radical party was of any significance. If they were all Nazis, why didn't the NPD have 20%?
You are the one who rewrites history.
They vote AfD because the traditional parties have failed them and keep doubling down. The AfD would probably also fail them if in power, but that is the nature of protest votes.
Same story in France where Le Pen is currently leading the polls.
As opposed to the BRD, where for example the "Auswärtiges Amt" had more ex NSDAP party members after 1945 than before?
There definitely was denazification in the east, but the totalitarian enclosed and literally walled of mindset did not help with creating an open mind towards the world. Add to that high unemployment and poverty after 1990 and you get the usual extremists on both sides of the spectrum.