The video ad shows two farmers talking about a pie one of them has just dropped on the ground.
Nigel, the "pie dropper", reacts to the incident by called it "gay". The other farmer tells him that, actually, it's "deeply disappointing" that he's dropped his pie, but "it's not gay".
It ends with Steve - another farmer - making the very matter-of-fact admission that he is "quite gay", to the surprise of Nigel.
The video had more than 84,000 views in the first day alone and has been shared nearly 2000 times.
Rainbow Youth has also put together a separate video with top tips on "how to be a good ally" and how to support queer and gender diverse people.