AfD is concluding with russia, a country which poisned people on EU ground.
AfD also has plenty of real nazis doing nazi shit and AfD is not excluding them.
AfD is not democracy. AfD is antidemocracy even if it would get elected democratically.
Here's a fun thing language-game to try: expand your definition of "democracy" to encompass your partisan political positions, don't tell anyone, yell from the rooftops that your opponents are "anti-democratic" and banning them is "democratic."
Then observe how you only convince yourself of your own righteousness, and further alienate the people you wished to persuade.
AfD fights against mechanism we have in place to protect the democracy.
Has nothing to do with my own righteousness. AfD could easily do things against all of this garbage and they don't.
If party A, being labeled as communist by party B, and party B, being labeled as fascistic by party A, both agree, as well as all other parties in-between, that you are a threat to democracy, maybe you are.
If you are looking for a party that labels itself democratic and all others anti-democratic, you need to look at the AfD themself.
Sometimes, democracy needs defending from people using its privileges to get rid of it.
One can (should?) tolerate a lot in an open, democratic society, but not (necessarily) everything:
* https://en.wikipedia.org/wiki/Paradox_of_tolerance
Then there's H.L. Mencken old line:
* “Democracy is the theory that the common people know what they want, and deserve to get it good and hard.”
IMHO this tactic is one of the drivers in the falling trust in institutions that we see across the western world. You can't simply dismiss your opposition as not tolerant enough as a way of winning a political argument.
Unfortunately, the Germans themselves have forgotten. Never Forget rings hollow these days.