i think we kind of dislike jokes about how rare trans girl tops are or that there's a "top shortage"
as someones who contain toppy elements, it makes us feel like a rare resource that should be rationed out and it makes us feel guilty for not topping, and that really sucks and makes us feel burned out. it's just an extremely depersonalizing meme.
hehe, an overabundance of bottoms~ I know this is a serious subject, but that is a funny phrase~