While I agree that this is really a non-issue and its a little sad that this is something that will get thousands of people on the streets to protest on both sides, I think that non-Greeks clearly fail to understand the importance of this issue to Greece, the idea that this is merely about snowflakism is clearly mis-informed.
The Greek region of Macedonia holds a significant part of Greece's population, so when another country continually implies a claim to that area, of course Greeks will be angry, especially those who live in Macedonia. Most other countries would react in the same way that Greece has reacted, if not much worse.
https://en.wikipedia.org/wiki/Luxembourg_(Belgium)
Never heard of Belgium throwing a fit about the country Luxembourg. Also never heard of Missouri throwing a fit about Kansas.