St. Patrick's Day was never a huge day of celebration in Ireland, at least not until after it became a big in America.     Because of that, not all St. Patrick’s Day traditions are actually Irish:

1.  Pinching people for not wearing green.  Americans started that  . . . and no one likes it.

2.  Drinking green beer.  Most bars in Ireland don't serve it.   To be authentically Irish, Guinness or Irish whiskey.

3.  Wearing green leprechaun top hats.   In traditional Irish folklore, leprechauns wore pointy hats , that were the color red.  Plus, St. Patrick was traditionally associated with the color blue, not green.