Elon Musk said on Tuesday that Taiwan should join China. The prime of that country responded by saying the billionaire "doesn't know anything" about the autonomous island. Beijing, which claims democracy as part of its territory, is always threatening to invade Taiwan and annex it. Advertisement Elon Musk said on Tuesday that Taiwan should join China, and the prime of that country responded by saying the billionaire "doesn't know anything" about the autonomous island. The richest man in the world has incited rage in Taiwan as a result of a Financial Times interview he did that touched on Taiwan's tense…