Calling them ''settler-colonialists'' and denying their rights for [asylum->identity-> referendum->state belonging] is direct violation of their 'human rights' as well.

No, it's not, as they're literal settler-colonialists, most of whom had been moved in by a colonial master, after a literal genocide on the native populations which literally emptied them of their own ancestral lands for long years, and they've never recovered from it.

Settler-colonisers don't have any rights in choosing for the self-determination of the future of a country. Same would went for any kind that had been settled in a similar fashion and via a genocidal policy. German settler-colonisers didn't have rights for self-determination after they've settled in lands during the WWII either, and same goes for Israeli settlers not have such rights on the lands they occupy, etc. They shouldn't have even gotten anything beyond resident permits or 'alien passports' but only allowed to stay for humanitarian reasons, but that sadly has been avoided.

We both know that those arbitrary understanding of "Human Rights" had been exploited by an bad actor

You cannot deny a native population their human rights via a silly pseudo-justification regarding 'they're exploiting their rights bro' - which typically means that they don't fit into the state narrative, national myth, or in-line with the state policies. They don't have to be such.

and your selective reading of Buzzword concepts is entirely hypocritical & emotionally biased at best,

Sorry, but no, there's no such a case outside of your strawmen in your fantasy world, lol.

"The Residents of Donbass" too weren't [Ukrainian nor Russian captives obligated to follow whatever Ukraine wants them to do]- They might have Russian Militants with Russian Loyalties but those are tiny details.

Surely, if we're to open the way for redrawing the borders in post-Soviet landscape, I can be all for it, especially if it's going to be done via denying settler-colonisers a vote. Then, Russia would be way smaller anyway, and would be kicked out of many of their imperial possessions. It'd surely solve the Eastern Ukraine question too.

Tiny details like the real number of N.Macedonian nationals residing on the territory of Bulgaria instead of utilizing their citizenships to emigrate to Germany

Mate, if they're Bulgarian citizens, then they can use their rights that's allowed them via being EU citizens. And you're somehow sad about that?

and just like with Greece the current Macedonian culture very much doesn't stand out from the current local one unless it starts to act in a bad faith.

Culture itself doesn't determine the ethnicity and nationality. You should be aware of that just by being from Balkans but here we are.

The tidbit that NGO's whom had build their entire career around suing Bulgaria with +6000 cases per year, exist only with the purpose of racketeering

They can sue Bulgaria all they want, as it's their legal right. If you do have problem with paying the fines, then don't commit faul acts? Who would have thought? /s