I love joke headcanons like this. It's the only version of the character fans will acknowledge until actual evidence is brought forth, at which point the joke will probably stop out of respect for the true canon (except for those beautiful cases where the headcanon turns out to be close enough to the truth, like Lapis and Peridot being roomies).

Really digging this fandom White Diamond. Just a complete douchbag iresponsable elder sister who couldn't give less of a shit about what happen to the other diamonds.