This is a redux. We live in a violent world. Groups are singled out in ways that go beyond ‘unfair.’ Jokes that are made at the expense of a group in order to sell a product are, in the very least,cheap. Add to that, the concept that your company is putting down a group of people–Would you now sell Boston Car Bombs?
Would you have Columbine Specials? Rename your product. Give it a name that does not put my people down. Do not sell cupcakes that you name “Irish Car Bombs.” The joke is dreadful & tasteless & offensive. Do your job, and change the name of this product.