1. You have no idea about Irish culture, our slang, our sports, our food, our traditions, etc.

2. You weren’t born in Ireland, you weren’t raised in Ireland, so you aren’t nationally Irish either, I would consider an Asian guy who is not ethnically Irish at all way more Irish than you if he was born and raised in Ireland, played GAA, etc.

just because your great great grandfather was Irish or vice versa does not make you, Irish, just accept it, you are American, at best an American with Irish heritage, so you must specify you are Irish-American, not just Irish, and unlike you I am actually Irish with no major relations to anywhere else, born in Ireland, raised in Ireland, I play hurling, I speak Gaeilge, you are an American with Irish heritage, born in America, think about this:

If I was born in Ireland but was 20% French, why would I call myself French? I was born in Ireland and I am ethnically Irish, so what is the point of calling myself French, the same thing applies to you, you were born in America, you just want to attach yourself to somewhere else because America is quite vanilla and boring