A fish rots from the head. Corporate culture all flows from the CEO and board. If a bigoted piece of shit is in charge, this is what you get. Because the top of the company sets and enforces policy. So if they don't care about bigotry or if they are bigoted themselves, they won't set or enforce policies to stop it. They will hire bigoted management. Those bigots won't stop it and probably encourage it. They hire bigoted workers who will persecute others and face no consequences. Those who anti-bigots can report but will be ignored or face retaliation.