I grew up in N Ireland and Protestants didn’t celebrate St Patrick. When we were permitted a parade - we were ordered to stay in our own area. When Protestants celebrated King Billy, 12th July, they insisted in parading into our area with their Orange sashes yelling insults at us. We were a minority in our own country. Today things are much better though many Presbyterians/Calvinists remain embittered but can’t act it out the way they used to...in fairness the Methodists and Anglicans were always a lot more respectful and join in the celebrations - they were probably afraid to in the past because of the ire they’d get from the orangemen.
Protestants don’t really celebrate the birthday of anyone except Jesus Christ ( and his date of birth isn’t even certain ).
The Saints Protestants quote most often for instance are Paul and John, yet, they don’t even celebrate their birthdays ( well to be fair, we don’t know when they were born ). Protestants don’t even celebrate the birthdays of Luther, Calvin or Wesley.
I also note that in the USA, especially here in NYC, St. Patrick’s day has often become an occasion for drunken revelry such that a huge number of Policemen have to be called on duty to prevent it from devolving into fights ( which have oftentimes occurred ). St. Patrick would have disapprove of what has happened in his name.
However, for me personally, celebrating or not celebrating someone great Saint’s birth is secondary. The important thing is we EMULATE their faith and their example. That honors them more in my opinion.