Some say the "dissing" was the thought that Zimmerman was a homo out to rape a young teen boy. Martin's girlfriend said Martin said it was a creepy ass-cracker following him, a term blacks in the South use to describe homos after boys. This may be why he was so angry, doubled back and sucker punched Zimmerman.
I'll acknowledge that's a possibility.
It doesn't seem likely, but it's a possibility.
Granting that possibility for the sake of argument, then Trayvon Martin completely misread Zimmerman. That was one mistake in a series of mistakes that cost Martin his life.
His second mistake was in not going home, but deciding to confront the situation personally.
His third mistake (a bigger one) was to decide not to call the police with the cell phone he had in his hand, but to go initiate a personal confrontation alone against the "creepy-ass cracker."
And his fourth and most fatal mistake was to physically attack someone who clearly had not attacked him first.
And that series of mistakes was fatal.
Not really much different from a 17-year-old kid getting killed in a car. You can't expect to drive 120 miles per hour in a 50 mph zone and not risk losing your life. And you can't expect to attack a stranger and try to kill him and not risk losing your life.