I tend to be a nice person in Public Free Roam, because I really have no reason to kill people. I usually just approach them and maybe we do some gang hideouts.
Although, very often, the person I innocently approach decides to be not as nice and cheap-shot me. They will soon regret this. When this happens, I come back, and blow there face off before they can even flinch. They'll respawn, and either engage in combat, or run away. Either way, I ALWAYS kill them. I'll continue killing them until they either send me an apology message, or quit the server. They usually try to fight back, fail, and then quit the server. Although, a couple of times I've had the person message me apologizing for killing me the first time. XD
Needless to say, don't mess with me in Public Free Roam, you will pay.