I get those white reflective ones too...along with blonde, black, red, and the overall general color of brown. I'm not worried about it, and I can't imagine plucking them out is going to help in the long run. I do think tho that once I start getting seriously grey I'll start coloring. I've always wanted to dye my hair lots of colors, but I really like my natural color best, so once that starts going I'll go crazy with the color!
My special name for him has been "GreySpot" for years. He likes his greyspot as he sees it as unique.