Perhaps there are two lessons learned here.
First, Facebook is not private. Even if you think it is.. even if you set it to private.. even if you believe you’re getting away with untoward comments.. you will be seen.
And secondly? Don’t be stupid, racist, and ignorant. If you’re stupid, racist, and ignorant, then stop being you.
It will save you the agony of such things as this article describes after the viral dust settles..