1.) Somebody who hates homosexuals, but either is in denial or doesn't tell anyone.
2.) Somebody who hates closet homosexuals. They can have admitted it, or be in denial/won't tell anyone.
Person 1: Woah, did you hear about Person 3 putting a bomb in the gay bar?
Person 2: Yeah! I didn't know he was a homophobe!
Person 1: He must be a closet homophobe.
Person A: Oh my goodness! Someone just shot and killed Justin Bieber!
Bieber Fan: NOOOO! I hate closet homophobes!