When somebody who does something wrong turns the table and acts angry towards the person confronting them.
Angry person: "Why did you eat my chocolate candy bar?"
Anger flip person: "Why did you leave it out, you know I can't resist chocolate? That was so inconsiderate of you!!!"
When you confront somebody who has disrespected/wronged you in some way and instead of being apologetic they act angry.
Victim: "Ouch! Why did you step on my foot?"
Anger-flipper: "Why was your foot there!? How about giving me some freaking space, asshole!"