Just because someone is "really smart" does not give them license to be "really dumb" when it comes to enabling an inclusive culture, in a company where they have the responsibility of being it's CEO: vis-a-viz, being responsible for the company's employees.

He facilitated a workplace culture that, whether my omission or commission, was toxic for some of the people who worked there. Even if that was 0.001% and he wasn't demonstrably trying to bring that number down, he failed. Being a CEO is not "just" about bringing in profits at any cost, including that of the welfare of the employees.