You can say "upper-crusty toff", we don't take it personally. The derogatory term the Irish use for us is "West-Brit".

I went to a fancy boarding school in Ireland where we learned Latin instead of Irish, and where children were mocked for having an Irish accent. Which almost none of us did, despite almost all being Irish. Well - Anglo-Irish. My own family is technically indigenous but Protestant, but we're indistinguishable from the rest of the Anglo-Irish crowd anyway so it's a bit disingenuous to claim I'm not one of them.

Anyway, my point is there's a tiny minority class of Irish aristo gobshites who speak RP and live in big fancy houses in the country. Wilde would very likely have sounded like one of us.