As a counterexample, my bestie is "brown as a paper bag", and he was convinced he couldn't get a sunburn, up until he did.
Unrelated, he also swore he couldn't get poison ivy, until he literally rolled in it to prove it to me. I found the aftermath more amusing than he did.
Unrelated, he also swore he couldn't get poison ivy, until he literally rolled in it to prove it to me. I found the aftermath more amusing than he did.