Avoid applying double standards yourself

To find out if you're dealing with a double standard or not, consider these 2 questions:

• Are two (or even more) things (persons, situations etc.) being treated differently?
• If there is a different treatment, is there a proper, valid justification for it?

• A person who judges and criticizes another person for doing something, even though this person does that very same thing repeatedly and doesn’t see an issue with it when they’re the ones doing it.
• Treating similar employees differently when they do the same thing, by punishing one ...

Doing what everyone else does is going to bring you average results. 

Whenever you’re betting against the consensus there’s a significant probability you’re going to be wrong, so you have to be humble, seek out and understand relevant information and learn to analyze things differently.