I worked at a company where this was an issue at one point (granted this was one situation among a lot of employees). A manager was pretty much dismissive of everything anyone of a lower caste did / wouldn't communicate with them effectively. HR absolutely struggled with the issue. The HR folks tasked with dealing with discrimination issues largely had spent their time constructing company wide emails and classes tha…
I'm a white dude, and had an incident a number of years ago in which a group of Indian contractors basically didn't want to work with me because I was a white dude. Used a number of slang racist terms in my direction. I didn't make a stink about it because I was a consultant just there on a short-term project, but it was memorable. As another commenter suggested, even the whole "white people" branding that happens in social media is comical, given centuries of one white group looking down on another white group. I'm glad to see this kind of social dialog about racism / classism in all of its forms and think it is very worthwhile to realize that it isn't just about the stereotype of white (males) hating on everyone else as is generally portrayed.