NOBODY should be saying "lighten up." I don't think you understand the context in which "lighten up" is being used here. "lighten up" here is when you say that

NOBODY should be saying "lighten up." I don't think you understand the context in which "lighten up" is being used here. "lighten up" here is when you say that after a serious offense has been made. And it's not a straight white male that is always saying it.