If somebody told you that an entire ethnic group's name and identity was being changed to appease its oppressors, you would react in outrage. If they followed up by saying, "Oh wait, it's a diplomatic dispute", would your response be "That's okay then. They should resolve this dispute by denying their own existence"? This is what's happening to Macedonia and Macedonians.
Every day, I listen to old white men discuss how they're going to change MY ethnicity, my country's name, identity, language, and history - all in the name of appeasing our oppressors - who deny our right to exist. Imagine this happening to you and your ethnic group. It's surreal.