Why it should be pronounced "GIF" and not "JIF"

So in the latest episode "We Die On Our Hills" Bob says that we should pronounce GIF as JIF (basically) because you pronounce gi as ji, just like in giraffe and ginger. I disagree. GIF is not a word but an acronym of Graphic Interchange Format. And how do you pronounce the "graphic"? That's right, as graphic, not "jraphic". So why should we say GIF as JIF if the first word of GIF is pronounced with a 'hard' G?