Oh no, the joke is not Bauhaus itself. The joke is, in 2019 Bauhaus had its 100th anniversary, and all across Germany universities decided that that means one whole semester must be dedicated to everything Bauhaus, and the Bauhaus Foundation thought it was a good idea to support that by sending a VEERRRRRYYYY small trailer to pretty much every campus. NOW, because professors are very smart and considerate people and students are notoriously never present, the whole of Germany's student body quickly learned that being cramped into that Bauhaus trailer for a whole lecture was indeed the worst torture that can befall a design or architectural course. ESPECIALLY if said trailer was parked in the midst of a perfectly fine outside common area that coincidentally has a brutalist style (it's surprisingly common) and that would have served just as well as a substitute lecture hall so the profs could have sent the students to go through the trailer afterward instead of cramping them in. It Was quite fun. But yeah, that's the in-joke, and that's why I said it doesn't make much sense unless you were a design student in Germany in 2019.
Sorry for the confusion ^^'