Police said Randall White, 49, complained about the speed of service at a St. Petersburg pizza shop Sunday afternoon, and was admonished by another customer in line, Michael Jock, 52.
It "prompted them to exchange words and it became a shoving match," said police spokesman Mike Puetz.
White allegedly raised a fist, and Jock, holder of a concealed-weapons permit, is alleged to have responded by pulling out a handgun and shooting him twice, the Tampa Bay Times reported Tuesday.
After police officers arrived, Jock told them he feared for his life, mentioning the controversial Florida law that states a person is not required to retreat from a confrontation before using deadly force.
"He felt he was in his rights. He brought it up specifically and cited it to the officer. We determined it [the incident] did not reach a level where deadly force was required." Puetz said.
Jock was arrested on charges of aggravated battery with a weapon and shooting within a building. White was treated at a hospital and released, the newspaper said.