Some dictionaries (and I’m not going to look it up and quote) define black and white as being opposites of each other—black is evil, negative, lacking purity, white is pure, clean, untainted, etc. Some colloquialisms are so ingrained, that we don’t think of them as having any racist connotations.
Examples: heeby jeebys(sp) refers to Jews/to gyp (jip) someone refers to gypsies
Who knows, maybe white picket fence began a reference to where white people lived.
In this case, black is referring to a color, so no, not racist. But, that doesn’t mean that in another situation, were someone to refer to the color black in regards to someone’s personality, heritage, nationality it would not be racist.
Many people (mostly caucasians) do not understand the power words have to cut and demean, and oppress. The term white has never been used to describe something as negative, evil, or in some way faulty. I won’t even use the term ghetto because of the way it can refer to race.