'Sunshine' is a racist term?

[snopes]

Comment: I was recently at a work meeting where appropriate language, comments, jokes, etc.
were being discussed. One of our co-workers made the point that the word "sunshine" if
used as an epithet, or if addressed to, a black man should be considered a racist term.

I have never heard of this usage before, nor apparently had anyone else in
the room (apart from the fellow who brought it up). An internet search
found a few similar remarks, although there did not seem to be any
consensus as to the validity of the statement. It was suggested that
there was a misunderstanding with the similar word "shine", once a more
common derogatory racial word. The discussion was in reference to an
alleged incident on a Seattle bus a few years ago. A more recent
reference concerned another incident at a restaurant in Truro, Nova
Scotia. Since I am in Halifax, Nova Scotia, I am wondering if this is a
local recent phenomenon (either of a re-awakened understanding of a
forgotten term, or a re-occurence of a misunderstood term).