I'll be perfectly honest, I judge people based on looks. Black nail polish on guys doesn't even register as odd to me anymore and I've never really seen a guy with black nail polish mistaken for gay, or as emo/goth unless the clothes go along. I've never seen someone judged as gay for it, either, most of the guys I've seen with black nails have no problems picking up women.
If nothing else it'll signify that you're upper class and don't have to do manual labor for yourself
