I'm going to point out a double standard.
What is the double standard that you want to point out?
My boss treats the men and women in the office differently.
It's very honorable to say something when someone is treating others unfairly. It's wrong for their to be double standards in the office. I think speaking up is a good idea.
My boss waited for me to leave and then called me a loser. He said I'm not welcome in the office anymore.
Well I am sure that is pretty hurtful if you feel like you are not being treated fairly. Having a conversation about this really just seems like the best way to go about fixing it.