I was actually wondering about that; I recently screamed myself hoarse while putting my fist through a window (long story) and when it got better I found that my voice can hit highs I havent hit in years...which makes no sense really...just recorded a new acoustic tune a couple nights ago, and I'll be damned if my range isnt better
Perhaps Americans are different but I tend to find that by and large, family members are more likely to tell you that you can't sing well, even when you can !