One of the fun points (or perils, depending on your sense of humour) about being an internationally known superstar is that parody videos of you doing anything at all spring up all over TheInternetTown.
The video was uploaded by One DIrection spoof-group One Orientation, who say;
"That Makes you Homosexual" is a parody. We are ONE DIRECTION FANS! This is not intended to be negative towards the band! We DO NOT THINK THEY ARE GAY! We love the song and this is our FUN take on it. EQUALITY for all. Thanks for sharing!"