Neighbor has erected a 180cm high fence without final coordination

If it doesn't bother you for months or years and you then run to the building authority because he is behaving foolishly

He is not, if I understand correctly, but only once threatened it when the neighbor was being rude to him.

It is truly unbearable that this completely made-up nonsense sticks with the motto "just throw shit around, some of it will always stick." I did exactly what I wrote: When the neighbor spat absolute dirt at me about how the children are not allowed to play in the garden (I had informed myself very thoroughly about the legal situation, he had not), I explained to him that his hedge violates the municipal fencing regulations in three aspects (also here: I had informed myself very thoroughly about the legal situation, he had not) and I demanded its removal. Nothing else, even if a single poster keeps making this up and then calling it a fact. Lies do not become true just because you keep repeating them.

He is not, if I understand correctly, but only threatened once when the neighbor was being rude to him.

Just for the record: No, I did not, that is a lie spread by another user.

You did, and now that's enough. If it doesn't bother you for months or years and then you run to the building authority because he behaves stupidly, then that's snitching, tattling, call it whatever you want. It didn't bother you in the years before either, and by having to remove the hedge now, he certainly won't become a friendlier neighbor. You stabbed him in the back, own up to it, for goodness' sake.

No, he said it to the neighbor's face. Not to the office. According to his account—if you know better, you might be that neighbor? You do at least write "doer comments": First do, thinking comes later. By the way, the way the OP wants to approach the case in the topic, I think it's exactly right.

are you possibly this neighbor?

I have actually seriously considered that as well.

By the way, I think the way the OP wants to approach it in the case of the topic is exactly right.

Yep

Just for the record: No, I did not, that is a lie spread by another user.

Thanks for clarifying again :) And don’t take it too hard, it can happen that something simply gets misunderstood or overlooked somewhere in the vast internet.