Offense is a spirit you decide to pick up and carry around. If you're offended, it's not the fault of the thing that is the object of your offense. It's your own fault because you made the choice to let the thing offend you. Because you wanted to be offended.
No one picks up offense more than a left-wing atheist, It's pretty much their reason for living. They sit around and take offense at things other people believe in, express and live by. If they have a belief system of their own, it's basically, I believe that you're offending me!