Screw that. There is nothing mature about it. Instead of counseling his own camp of hyperventilating morons, he attempts to tell other people what to accept. Well no one will accept anything just because he and all his fellow losers got their feelings hurt. Respect is earned with attributes not bought with threats and tantrums.
If that person had the same grasp of geography or history he would know there is no offense intended by such displays. Just in modern times alone, Ertirea has been a province of Ethiopia longer than it has been an independent state. We share language roots, culture and religious ties. These things will remain regardless of what borders and administrators looked like in the past, today or in the future.
A sign acknowledging this fact during a cultural event both countries are celebrating is not an offensive sign. But of course these losers and their boundless insecurity think ordinary citizens putting up such a map must mean it is an attempt to control or invade..
It is true. Amharas, like many other Ethiopians, didn't support the succession of Eritrea. We will always be on the other side of anyone planning any future secession of any part of Ethiopia. This is true for the vast majority that consider themselves Ethiopians, not just Amhara. But despite our issue with the breakaway, the ones we relied on to prevent it failed to do so. As a result, Amhara and Ethiopians at large see this as a closed chapter.
Personally at this point I have no interest in seeing Eritrea return to Ethiopia. The only connection I'm interested in with Eritrea is what we already have with Sudan, Kenya or Djibouti. A friendly neighbor that minds it's own business and comes around only to cooperate on issues we find mutually beneficial.
Never mind an invasion or some forced takeover, the only way I would support a return is if Eritrea first holds a referendum where an overwhelming majority of its population asks to return. Then they would have to make that request formal. We would then need to have open discussions internally about all the implications. We then need to have a referendum on that question in Ethiopia, which should also be affirmed by an overwhelming majority. Only at that point would I support it.
Till then they need to act like the sovereign state they claim to be and go build their own communities and stop demanding things from other, actual sovereign people.