Why is the news so boring in the summer? There aren't any school shootings.
What caused you to joke about something like this?
I don't know. I don't think it's appropriate to joke around with school shootings but at the same time I don't think it's something to be very hurt about.
Making a joke about school being boring because there are no class shootings is pretty dark. Class shootings are not something that anyone should find enjoyable, and joking about finding them enjoyable is a pretty big red flag for anyone who may see your comment.