Lots of little boys want to try it when they are in the late toddling years just because they are curious and sex roles aren't set at all in their minds yet, it's not a big deal that they want to try it if the mother paints hers, like mamacags said. My wife doesn't use nail polish so it never came up with our boys.
However, the story at that link is as gay as Castro Street in San Fran Freakshow, it's just a mother turning her boy into a girl.