While Cena didn't speak specifically about the case, in an interview Friday he said that what people wear isn't the main concern: `It's the demeanor."
Cena is in Miami for Sunday's WrestleMania, and he's also been active with the Be A Star anti-bullying campaign.
Cena says he was bullied as a kid because he loved rap and wore hip-hop clothing in a town where it wasn't popular. He started lifting weights to protect himself.
Seventeen-year-old Martin was shot and killed in Sanford, Fla., last month by a neighborhood watch volunteer who has claimed self-defense and has not been arrested. Martin was wearing a hoodie when he was killed.