Was Cotton picking or cotton picker used as a racial slur?

It can be, but generally it is accompanied by another slur to make it a racial slur or with a cuss Word, for example :fu**ing cotton pickers, or "cotton pickin ni**er"... i am only using those examples so you can get a clear idea of what a racial slur involving the phrase "cotton picker" would be like, not to offend or degrade anyone.