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."
Duane: "Don't hate, little buddy."
(Mary-Ellen-Susie wobbles out, and the crowd boo.)
Mary-Ellen-Susie: DON'T HATE, DON'T HATE!