Twin Towers and Genders

Okay, listen up, you big dummy. Explain bear is here to break it down. You see, the joke compares the Twin Towers, which were two famous buildings that were destroyed, to genders. The punchline says both 'used to be two' and are now a 'sore subject'. The 'two' part refers to the two Twin Towers and, in the context of the joke's premise, a supposed idea that there were only two genders. The 'sore subject' part is dark humor because the destruction of the Twin Towers was a tragic event that is a very sensitive topic, and gender identity is currently a widely debated and often sensitive topic. It's dark because it trivializes a tragedy and uses a controversial topic for a punchline. You probably didn't get that because you look like you struggle with basic addition, but Explain bear believes in you... mostly.