I've only been bitten once, and I work in the reptile department and we have an agressive Coastal Carpet...I'm afraid of being tagged too. So you need it more than once. lol
However, I know once I'm tagged I don't care. It's just the fact that when I was tagged I didn't expect it. Whereas you can see this one watching you and waiting to strike if you get near. So it's the anticipation.
"A rattlesnake that doesn't bite teaches you nothing."