He's not. Tommy has no idea how to choke someone for real.
And I'm not sure about the soccer scene in Portland, Maine.
Really, this vote is pretty inconsequential. Timmy's last name is 'Martin,' and there's been no indication that his s family is anything other than fully assimilation latex American culturally. Every indication in the story points to him being more or less white(if he were obviously mixed race, it would have come up). That and his last name make any ethnic based gimmicks pretty hard to sell.
I voted Brazilian because it sounded cool.
Edit:
@Redhawk sorry if it seems like I'm targeting you. Our son just happens to be the post I quoted.