Neighbor has erected a 180cm high fence without final coordination

Can someone explain to me where I suggest that the reaction was not right?

But what does that change about the fact that someone informed on their neighbor to the authorities?

Is the choice of words not approved? Well, reporting a "crime" only after years... that is "informing"… because one knew about it all those years. Whether you like it or not.

You really see different posts than everyone else, including me.

You seriously call it a fact that I "informed on someone to the authorities." That I have written the exact opposite multiple times above: you don't care.

You ramble about "reporting a crime" - I really don’t know in which parallel world you live/read, perhaps there is someone with the same nickname in another forum you’re referring to?

I have clearly written a) what I did and b) why I wrote it here. Accept it or ignore it but please don’t fantasize anything into it.

It's not about the choice of words. It's about the fact that I can't find that content-wise at all.
And "verpfeifen" as a word implies shabby behavior, denunciation.

I, on the other hand, think: Neighbor has an illegal hedge, behaves badly, is then "subtly" confronted face-to-face about how illegal the hedge is, and then decides to remove it.

That's just how it is as a "doer": Those who act without thinking it through to the end sometimes have to do it twice. Or as my grandmother used to say:

Wat e nich im Kopp hass, musse inne Arme haben.

Sometimes the "victims" are simply the better thinkers ;)

That's exactly how it is. And that's what I'm concerned about.

Additionally, and that's why I find answering such questions in the forum simply difficult: Someone relies on it afterwards. Of course, it's more modern to ask a question in a forum like this, but at least from my experience, the calls to the office during my house-building process were really well-invested time. Usually, you also get to clear up half-knowledge from forums and make things clear: Yep, that may be the case somewhere, but here there are municipal guidelines. If I don't like these, then I can first try to get an exception permit – look, I got it. Or I can consciously ignore it ("doer"), but then I should be aware that I make myself vulnerable by that.

The building authority unfortunately does not comment on this, as it concerns private law (private building land vs private building land) and they only make statements regarding public law (property boundary adjacent to public area). The neighbor has initially stopped any further action and we will talk on Saturday.
My goal is to settle this privately in a reasonable manner; in the end, I want to have a neighborhood where people respect each other and interact reasonably. You don't have to be best buddies.

That sounds like a plan.

The fact that the building authority doesn't say anything about it - hmm, I would ask them again if there is a municipal enclosure statute. If not, great, then state law applies. Here, the planting (both the mandatory trees required for new construction and the permitted hedges) and the fences are assigned to the Department of Environment, Energy & Waste Management. If they also say there "do whatever you want" - great.

You seriously call it a fact that I "tattled on someone to the authorities." That I have written the exact opposite above several times: You don’t care.

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’s behaving badly, then that’s tattling, snitching, call it whatever you want.

It didn’t bother you in the years before either, and by him having to remove the hedge now, he certainly won’t become a friendlier neighbor. You screwed him over, own up to it, for goodness’ sake.

You have 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 what you want.

It didn't bother you the years before either and by making him remove the hedge now, he will definitely not become a friendlier neighbor.
You stabbed him in the back, admit it, for goodness' sake.

Please admit that you come up with the wildest nonsense and present it as fact. None of what you invent here has any relation to reality and/or corresponds to what I have written here.