It also has to do with how traps are perceived. You ever see a trap being an obnoxious, politically obsessed shithead? The same way you have to be capital B politically "Black" to be considered black, you have to live the stereotype insane political tranny to be "trans." A trap is similar to a tranny, but has the property of being likeable (or fuckable, in some cases) and the trannies absolutely will not abide having that as competition for their political message or public attention.