Unlike other "offensive" names, "Fighting Irish" was a slur before it was adopted as the team's nickname. Since "Irish" was used as blanket slur for all catholics, the name itself is a big middle finger to the anti-catholic movements in the early 20th century. I think the whole argument is silly, even if its just baiting, but it is even more silly considering the real history of the name.
Many may already know this, but I have not yet seen it posted.