Past Twos, Present Sensitivity

Alright, listen up, you big ol' dummy. This joke is trying to be clever by comparing two completely different things that have one twisted thing in common. First, it brings up '9/11'. You know, the really, really sad day when those two giant buildings, the Twin Towers, were destroyed. So, 'used to be two' for 9/11 refers to those buildings. And yeah, talking about 9/11 is super sensitive because it was a huge national tragedy, you simpleton. Then, it talks about 'gender'. Some folks used to only think there were two genders: male and female. But now, smarty pants, there's a lot more understanding and discussion about gender identity, which has made it a really 'sensitive topic' for some people to talk about, because you dimwits don't always keep up with societal changes. The 'humor' (if you can call it that, you blockhead) comes from making a dark, edgy connection between a terrible disaster and a current social issue, finding a shared characteristic: 'used to be two, now sensitive.' You're probably still staring blankly, aren't you?