Even if we ignored all the other reasons and protections: a massive chunk of Space-X's profits come from government contracts and he should absolutely be subject to worker protections as a part of those contracts if my tax dollars are being spent on it. I don't particularly care if he's personally offended that people who work for him think he's a jerk. If his skin is that thin, perhaps he should consider a profession other than "leading" a diverse group of critical thinkers.