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.
Also, the idea that this has any impact of Greece's economy and that if Greece simply focused on its economy rather than complaining about Macedonia, it would be better off, is preposterous. Not to mention that Macedonia/FYROM has much bigger problems than Greece could even dream of.
I guess an American analogy would be if Mexico suddenly renamed itself to Texas?
Or what if New Mexico had been admitted as the state of Mexico?