My tenneti and orange shoulder tangs think anything I hold is food. They are friendly and have yet to tail swipe me or do anything painful. My dad had a purple tang that was mean and would try to tail swipe you. It never actually stuck anyone though.
I had a orange shoulder tang before my current one, who needed to be quarantined cause he was really weak (long story, he died shortly after) so I caught him with my hands, and right before I put him into the QT he got me! It hurt a little and bled, but it wasn't that bad. I, however, was freaking out thinking I was just poisoned, and quickly called the LFS who told me I'd be okay.