For sure "Oh, you're Irish? Whereabouts are you from, because I lived in Dublin for awhile?" is a lot better received than "Oh, my 9x great-grandpa is from Enniskillen"
it is handy that all my Irish forbears were mostly Protestant preachers from Antrim because it means I can’t go over there and start to Blarney it up
(Inasmuch as I have connections through friends and marriage it’s all Galway with a splash of Kildare)