Sway is a slur used to describe Blacks in a derogatory way. They tended to sway from trees back in the Civil War days.
The word Sway is a racial slur that has been used historically to degrade and dehumanize blacks. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to blacks. If you are unsure about whether or not it is appropriate to use the word Sway, it is best to err on the side of caution and avoid using it in any situation.