I was focused on the information the referencer added. The song makes no mention of labor or idiots. The tweeting author's message is that there is a distinct value difference in laborers and idiots. Please excuse me, I took it too personally, because I am not only a laborer and an idiot, but I am also boy who is predisposed to an attraction to yards containing milkshakes. 🥤
The joke, and I can't believe I have to explain it to you, is that if her milkshake brings the boys to the yard, they better make it worth making a milkshake.
If the song lyric was "my milkshake brings the girls to the yard," the joke would be exactly the same.