I drink in Paddy's, I can say with out a shadow of a doubt, there is nothing in the pub associating it in anyway with Celtic or it's fans. There are tons of photos of the regulars before LC Final, SC Semi, 1st division champions day, ticket stubs, Illustrated St. Mirren pictures, a Saints shirt behind the bar and there used to be a massive Saints badge on the wall of the bogs.
Some guy has passed the pub, saw the name, saw St. Mirren fans inside and has exploded with seethe.