Sorry, that is not an ethic thing...it's a ghetto thing. I am a black woman (not AA, I can't give you the name of a single African in my family tree) and I find this practice common with women who have ugly feet, strippers and those with self esteem issues. I get pedi's once a month and polish changes every 2 weeks, when my toe nails grow long I get them cut. No woman in corporate America or an ounce of class gets acrylic nails put on their feet. I live in Texas, we wear sandals year-round so it is imperative to have your feet presentable - they don't have to be tacky.
***drops mike and walks off stage***