The world’s richest toddler is at it again. Elon Musk, a very stable tech genius, is throwing a temper tantrum over Mark Zuckerberg launching the Twitter rival Threads. You would think a capitalist such as Musk would welcome a little healthy competition, but he doesn’t seem keen to compete in the business arena. Instead, he has challenged Zuckerberg to a “literal dick-measuring contest”. Musk, who is 52 years old, prefaced that invitation by tweeting: “Zuck is a cuck.” It’s not clear whether he had professional help crafting this zinger or if it came to him in a flash of brilliance....