Not being able to help someone who is refusing to provide technical detail is a pretty damn good excuse in this industry.
If your goal is to expose the bad excuses of others, step one is to put in as much effort as you're expecting from others. :P
Edit for good measure: (links fixed, forgot about direct linking comments from outside of a lemmy instance)
Your instance was not federating with lemmy.world. [1]
You assumed that the blame had to rest on lemmy.world because you had "eliminate[d] all the possibilities [you] had at hand". [2]
You made this post to vent about a bunch of unrelated nonsense and refused to provide technical detail that would assist the admins in troubleshooting. It's a given fact that your privacy is your choice, but it's also a given that you shouldn't be a dick about it if you choose to withhold details, even from PM. For the record, the information being requested was the bare minimum for an instance administrator to troubleshoot network interactions with a remote instance.
A random (but cool) third party identified the issue with your instance not federating. [3]
Instead of apologizing, you proceeded to act like you were entitled to that solution from the admins you wrongly accused. [4] You are not god's gift to the internet and they are not technical support for your instance.
There's no room for niceties here, you are either an asshole in denial or some brat who is too young to know any better. Sleep on it. Come to terms with that fact and make good on it, or don't. You aren't worth anyone's energy, and I'm only bothering with this summary for everyone else's sake. Your problem is fixed, it was never on lemmy.world's side to begin with, and somehow you are still acting like the failure of the admins to figure out what was busted with your shit is some Sherlock gotcha moment.
I am unaffiliated with lemmy.world and my toxicity does not represent the opinions of the admins. (but they're probably thinking it)