I'm not sure why people keep posting new threads to make fun with The DAO, Ethereum and Vitalik Buterin. We saw videos, memes and everything, but the truth is that personally this failure makes me angry.
You are right it is not funny. But people are responding with memes and jokes simply because the Ether hype got so extreme (for example I got spammed with dozens of personal messages on reddit, promoting ether, as did everyone who ever posted on the r/bitcoin subreddit).
It's the extreme promotion that has made people respond with jokes.