That would be the Irish sense of humour.
Man, that's like calling a Canadian an "American"! The Irish don't like being called British, that's for sure. Ireland's been an independent country since 1912, and darn proud of it.
I'm not just nitpicking. The Irish SOH is a lot cruder than the British, and I don't think I'd use the word "stoic". "Crude", "brutal", "profane", often "scatological", that's the fookin' Irish sense o'fookin' humour for ya, ya bleedin' gobshite ya!