No, at least in Germany the laws depend on the context. You can't use a racial slur to insult someone, but pronouncing it to talk about the word with students would be perfectly allowed (and how else could you explain to them that they shouldn't use a word, if you can't even pronounce it? Wait till they hear it somewhere else and repeat it?).

That's not true. You can use any racial slur in Germany to describe said slur. The laws only ever apply to insults, which have to be directed at someone. There's no "N-word" equivalent where people talk about a specific word but then somehow don't say it.

You are making the same mistake like the people i was lamenting about - equating the 'bad' word with its use as insult.

The words are not regulated by law as you suggest, but insults are.