Strange, I thought Martin called Zimmerman a "creepy ass cracka," which is a non-racial term for someone acting as if they're a police officer or security guard. So, Martin either apparently thought Zimmerman was acting like a security guard or cop and attacked anyways or he meant it in a racially derogatory manner.
She said on CNN that she suggested Zimmerman might be a gay rapist and that's why he didn't want to go home, because he would be leading a gay rapist to his baby brother. But this is in direct contradiction to other things she said about him being "by his daddy house" and thinking "it was just a fight." She called no one, so obviously Martin wasn't worried enough to make her worried. However, this is a girl with severely limited intelligence who has demonstrated over and over that she will happily lie, even under oath, for whatever effect she feels she needs at the moment. I suggest that trying to find truth in Honey Dee Dee's statements is like trying to analyze the smile of a dog.
EDIT: She also testified that Martin called Zimmerman a "awesome dude". Within the above caveats of her veracity, it certainly seems that Martin had no racial animus toward Zimmerman, which would tend to support her later contention that "cracka" was not racial.
Honestly, being followed and approached (perhaps accidentally) by Zimmerman should in itself be enough to make Martin agitated, afraid, hostile and pissed off. I don't think there is much point in our trying to figure out WHY Martin assaulted Zimmerman, especially given that we can't even be sure it wasn't in response to Zimmerman grabbing him or taking a swing at him.