By Rob Lenihan Twitter and Reddit commenters are split over how to respond to the firing of SpaceX employees who criticized CEO Elon Musk. Fair or unfair? Stifling free speech or a response to workplace bullying? The SpaceX controversy spilled into social media as commenters posted their thoughts about SpaceX, the rocket company founded by Tesla (TSLA) – Get Tesla Inc. Report CEO Elon Musk, which fired several employees for writing a letter blasting the world’s richest man as “a frequent source of distraction and embarrassment.” The employees were complaining about Musk’s public behavior and h…