It's typically pretty hard to offend me, too, but as someone who knew kids at Columbine during the shooting who were injured (and still deal with both the physical and emotional fallout today), someone who has a son who will attend Arapahoe high school next year (and graduated from there myself), and someone who currently teaches a student who was at the Newtown elementary school when that shooting happened--this phrase felt like a bit of a gut punch. Yes, I'm a rarity that all three of those apply to me, but as a teacher, school shootings are always going to be a sensitive subject and I wish we wouldn't think it's OK to make light of them.
That said, will it change anything about how I listen to the podcast? Nope--will still have it on every week. But if we don't let someone know when something is bothersome, we have only ourselves to blame if someone continues.