a nigger is an ignorant person,therefore if you are not ignorant you are not a nigger.
a faggot is a derogatory term for a homosexual person.
gay is a term for a homosexual person.

what's the difference? a black person is not a nigger because they are black. no matter what term you use that describes a gay person it still means they're gay. some of them may prefer to be called people who live an alternative lifestyle even as opposed to "gay".