[[refers to any set of principles containing different provisions for one group of people than for another]]
Need an example? Here's one of the most common double standards (in gender): a man can has had from 5-10 sexual partners and is praised for it, while a woman who may have had 5-10 sexual partners is degraded and called "washed up", a hoe, slut, etc.
A double standard, thus, can be described as a sort of biased, morally unfair suspension (toward a certain group) of the principle that all are equal in their freedoms. The proverb "life is not fair" is often invoked in order to mollify concerns over double standards.
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I hate the male/female double standards. The one mentioned above is the most common, but I also hate the double standard on domestic violence.
If a man hits a woman, its a HUGE deal, but if the tables were turned, I doubt that it would be any fuss or an issue at all.
We can't blame anyone except for society.