Earlier quoted context omitted.
Jason is a bully. I've heard plenty of horror stories of people who have worked for him. I'm not surprised in the least and I'm extremely glad to see people standing up to him.
Just for what it's worth, as I know it isn't the same as working for someone - I interviewed for a position working directly for Jason and he was all class. I'm a designer and part of the interview process, as is often the case, was to complete a small design project. He flat out insisted on paying me for my time (nobody else in my career has ever even offered) and wouldn't take no for an answer, and was professional…
Assholes are manipulative, it's how they get away with it.
The problem is silicon valley is self-reinforcing with positive feedback, nobody rocks the boat and speaks ill (the subject of Jason's abuse above would never come out and say it) of others.
It is 100x harder to give a negative public view of someone than it is to give a positive.
Investors have more power than most of your employees and they will freely speak about you, associate with you in good times, many will run away in bad.
You should run extensive due diligence across all of them, and with people who worked with them - not the type of Silicon Valley 'good friends' that involve spending 5 minutes in a conference hallway with someone 3 times a year, or having dinner twice a year.