I would 'have a word' with anyone that said neither my children nor I can celebrate St Patrick's day or any part of our cultural heritage, because we're not fully Irish "pure bloods" or mixed race, which is pretty much what you are fearful of!
Nonsense.
I’ll tell you why it irks me, and it’s nothing to do with race.
DH and I are both Irish, both still living here.
I’m from the North, so grew up in the aftermath of the troubles with religious tensions impacting heavily on every aspect of our family life.
DH grew up in Dublin during a the 80s, with a lot of poverty and huge amounts of unemployment. Then came of age just as the Celtic Tiger came to a halt, with suicide rates going through the roof, young people having no other option other than to leave the country for work, many of whom didn’t return.
There’s a lot more to it than watching a bit of GAA and listening to a few Sean-nós songs.
So by all means celebrate the lives of your loved ones from Ireland. But as an Irish person still living here, it gives me the ick seeing people with tenuous links putting on a green top from the back of the wardrobe and instagramming a picture of a pint of Guinness to celebrate their Irishness.