Tesla Inc. Chief Executive Elon Musk defended his dismissive treatment of Wall Street analysts earlier in the week, saying they represented people betting against the Silicon Valley electric-car maker while also conceding it was “foolish” not to answer them.
The response came early Friday in a Twitter post, one day after the Palo Alto, Calif., company’s shares dropped almost 6%. The fall in the stock price followed Mr. Musk’s performance Wednesday on a public, after-hours conference call with financial analysts to discuss...