Stand your ground laws are completely dumb and useless. Let me elaborate... they are to protect ignorant cowboys and rednecks (if there is a difference), who lately seem to all be armed. The alternate to the stand your ground law is where people have a duty to retreat (unless you're in your own home).
Inasmuch as every Billy Bada$$ with a gun feels empowered to use said gun to settle a dispute, especially in light of the Zimmerman verdict (and similar cases as referenced in this thread). The law has been bastardized so that every moron with a gun now feels justified that they shouldn't have to swallow their pride and walk away, nor should they have to risk getting punched in the nose. Instead, the better alternative, according to the stupid law and the idiots it protects, is to use a gun to end the conflict.
A major complication in applying any claim of self-defense is that it is completely subjective. A person is entitled to use force to protect him/herself from an imminent assault. Note that there doesn't have to be an actual threat, but one that is perceived by the Defendant, and he/she is entitled to use the amount of force necessary to repel the attack. In all of this, the actual application of the law is someone claiming that he/she "felt" scared, threatened, etc. And when we discuss the use of deadly force, there is no living victim to tell any other side of the story other than the Defendant's self-serving version.
As you may be able to see, I find the stand your ground law to be outdated and barbaric, and people like George Zimmerman have their bad behavior vindicated by simply whining about their fear. If you're so scared, then feel free to walk away, rather than being empowered by the deadly weapon that is clearly needed when you go to the movies. Or better yet, simply man up and figure out a way to settle the conflict like a man.
Unfortunately the application of this law is used to protect cowards who feel empowered to antagonize disputes. In my humble opinion, a duty to retreat should apply more stringently to those who have CPL permits, as they are the ones who need to exercise the most restraint. If you're not tough enough to engage in an altercation without drawing your weapon, then you shouldn't have a gun, IMHO.