Elon Musk laughed at BYD in 2011. Warren Buffett's Berkshire Hathaway has made nearly 40 times its money on the Chinese EV stock 8 hours ago | By Warren Buffett. AP Images Elon Musk dismissed BYD as a Tesla rival in 2011, ridiculing the design and quality of its vehicles. Warren Buffett's Berkshire Hathaway has made a nearly 40-fold gain on the Chinese automaker's stock. Berkshire spent $232 million in 2008 for a stake valued at more than $9 billion today. Elon Musk laughed out loud at BYD in 2011, three years after Warren Buffett's Berkshire Hathaway invested in the…