The underrated part is where Trayvon Martin confronted Zimmerman non-violently and asked him why he was being followed. Zimmerman lied and said he wasn't following him, wasting an opportunity to resolve the issue.
Someone follows you, you ask why and they said they were not, then get out of the car and chased you. You tried for a straight answer and were clearly lied to your face and have a stranger pursuing you. Do you not feel threatened by this? Are you supposed to sit there and ask him again after he clearly lied to you the first time? This guy is stalking you and lying to your face, I'm not going to assume that we can reasonably hash that out.