The thing about Intel's culture that I observed was that it wasn't toxic at all. The worst thing that I could say about it was that it was boring, which was why I left so quickly.
If anything was "toxic," it could be that some managers and co-workers had very bad people skills... But that happens at all large companies. HR can't witness and guide every interaction between employees. In reality, when I was there, Intel's HR made every effort to create a culture where, if something "toxic" happened, they could fix the situation as quickly as possible.
Granted, things did happen. The "toxic" situations were more of ordinary human nature, and can happen anywhere, even in non work situations.