I do not understand the desire to pinch people. Nor do I believe that drinking  alcohol is a particularly good idea. And to be perfectly honest, I don’t know anything about the origins of St. Patrick’s Day other than it had something to do with the Irish and a Catholic saint.
I have nothing against rainbow colors, chocolate, or wearing the color green, though. Actually, I think green, particularly dark green, is actually very flattering on a large variety of people. And I don’t mind using the holiday as an excuse to explore Irish culture.
I like learning about cultures. I also have a friend who is an Irish dancer, so that particular culture has a soft spot in my heart. Irish dancing is amazing.
So, I don’t mind doing some sort of celebration, but I refuse to pinching people or getting drunk.