I'm just curious, not like I paint my nails or anything lol
Cause with some girls black nail polish looks really good.
Same reason why girls cant have highlights or non natural color hair. It stands out and is not the All-American look that Walt wanted. Anything different would draw attention to the cast member, which is exactly what the company does not want to happen.
Yeah I have to agree black nail polish can be seen as a negative colour. Personally I find it attractive when girls wear it *cough* Kim kardashian *cough* haha