When its your son or daughter that loses their life over an incident like this then I wonder on what side of the fence you'll stand.
That depends, was my son or daughter beating someone's head against the sidewalk after jumping them? Did my son or daughter start the violence?
So Martin is a "thug" for beating on someone but Zimmerman isn't for killing him?
Right, because Martin, not Zimmerman, committed assault and was the one committing the actual violence. Zimmerman didn't commit violence, he stopped the person who was committing violence.
So someone stalks you and confronts you and is armed, what do you do?
Gee, I don't know, talk to them? What I wouldn't do would be to wait until the guy is walking back to his truck, then run up and sucker punch him, knock him down, and begin bashing his head into the sidewalk.
Wait to get killed or fight for your life?
Why are you asking that question? Those weren't the choices presented to Martin. He had all sorts of choices, including just walking into the house he had gotten to (according to his friend, the prosecution's witness). Instead, he turned around, and ran back to Zimmerman, who was walking back to his truck. And attacked him.
You're not actually paying attention, are you?