I think it's because cat hairs are so fine that they can get anywhere. When you say you have a cat hair up your nose to a cat owner, they usually just nod their head in understanding. And cat hair in my food doesn't bother me either for the same reason you mention. I guess it might bother others though.

If that hair in the spring roll had been blonde, I might have convinced myself that it was mine. But no way I was going to buy coarse and dark. Blech.