My old Elven Street Sam wore offensive t-shirts all the time, because he was an asshole. One of my favorites was "Got Muscle Augmentation?" with an arrow pointing downward to his crotch. Another was "I LOVE METAHUMANS (they're delicious)," and "MOTHERS OF METAHUMANS (are easy)" (with the MoM logo, etc).
Ahhh, good times, good times.