I've never really owned too many Metal shirts with possibly-offensive slogans. I did used to wear a Tiger Army shirt with Vampira on the front and "All Hail The Darkness" on the back, which prompted an older lady at a coffee shop to tell me that she would pray for me. And I had an AFI shirt with an inverted pink pentagram on the back, but nobody ever got offended by that one. The only interesting reaction I ever got was a guy using it as a conversation starter in an attempt to hit on me. It was the first time I had ever knowingly been hit on by anyone and, even though I wasn't interested, I'll admit it was a nice ego boost.