Blindness is the only disability that's ok to stare at
I was at the store the other day and saw a guy with a red tip cane. I thought wow you don't see that very often and as i went to double take my mind caught me with "don't stare at the disabled", before coming the realization it was perfectly ok given the circumstance so I turned to have a looksy. there were some non blind people that caught me but it wasn't a big deal. Not like dwarves where you want to look at them but know it would hurtful.