There are plenty of legitimate reasons to hate Musk. Bashing spacex's safety isn't one of them, because falcon 9 has the best safety record in the history of orbital launchers. They launch astronauts all the time, and have never had a single mishap in a manned flight. They're even the people who are going to rescue the astronauts stranded by Boeing's screw-up, which I suspect makes them the only spaceflight organisation which is going to have safely landed more people than they launched.
Also, a fuel leak doesn't imply something wasn't fastened correctly. If that were the case it would have been leaking on the launch pad. Much more likely something was damaged by vibration or heat during the flight
I can't imagine what they're referring to when they claim his books are sexist. I'm pretty sure as many protagonists are female as male, and a significant fraction of the characters have no gender at all.
Of those who do have gender, it's not at all unusual for them to have changed genders once or more in their lives, and the only time I remember anyone making a fuss of it is as part of Genar-Hofoen's character arc in Excession, wherein he is shown to have grown as a person by doing exactly that.
Can anyone point out an example of what the author might be thinking of? I'm genuinely baffled