Obviously a little more tactfully. And really WIBU rather than AI.
One of my work mates has a tattoo reading something in Latin along the lines of Love always endures, followed by his daughter's birth date. It obviously means a lot to him and he like to show it off. Another colleague today said really loudly in front of everyone that the word order is technically incorrect and why would he do that as he is anal about other things etc. He was obviously very hurt by her remarks but she just kept on about how she has a degree in latin and can't believe he was so stupid.
IMO it doesn't matter, he loves it and its a bit late now isnt it so I pulled her aside, had been a part of the convo not just butting in, and said I thought she should apologise. For this I got a fair bit of shit from other peopl. But really WIBU?