So the two standards, it is a description that is the nature of prejudice, to punish unfair commercial morality (especially in a group) on the principle that all people have equal freedom.
So the two standard explanation is that the appearance of bias, the punishment is not justified in terms of ethics. (For any one group in particular) on the principle that everyone has equal freedom.
So the word double standard is the explanation that is characteristic of the prejudice,. The punishment is unfair in ethics. (toward any one particular group). On the principle that everyone has the freedom equal.