Ha ! ! !
Except, of course, for the Belgae, the Goidelic Kelts, the Brythonic Kelts, the Romans (and the attendant Greeks, and other people from all over the Empire), the Angles, the Saxons, the Jutes, the Danes, the Norse, the Normans and other flavors of Frenchmen, and William's Dutchmen, and the Germans who came in the wake of the Georges . . . yer crackin' me up here, McT!
I am of Irish descent--seven of eight great grandparents either of Irish descent or Irish immigrants, and the eighth a Scot--and i grew up in an Irish Catholic community--very small, to be sure, but more than just a single family. I have also visited Ireland more than once, and lived there for a time, illegally, until i was politely deported. I doubt that you have any more experience of the Irish than have i. I submit that you imagine these types, and never feel contradicted because if you see someone is not of the "type," but who actually happens to be Irish or of Irish descent, you immediately do not run up to them to ask them, and therefore never cure your ignorance.
One of the thickest Norn Iron accents i ever heard came from the lips of a very dark black man, who was a native of Ireland.