Ostensible meaning: "Don't criticize me unfairly, with hatred in your heart."
Actual meaning: "I may have committed a bad act (though obviously I'm not going to admit that in so many words) but you are far worse. At least I don't have hatred in my heart. You are a bad person."
Or: "I reject your right to criticize me at all, even when I am obviously in the wrong, and I show my contempt for the very idea by refusing even to engage with your justified criticism, implying that it is motivated by jealousy and vindictiveness."
You: "Duane, you trashed my car, killed my mom and slept with my girlfriend!"
Duane: "Don't hate, little buddy."