There is a big difference between this and not getting promoted by a manager who just promoted an easily identifiable inferior performer belonging to their own religion/caste. Or they praising that kind of a guy in every team meeting, or sending out appreciation emails for trivial stuff. It becomes more than obvious they building a case to promote their people.

I've even gotten cold stares for using the office budgets for books, Why do people like you have to read books and get better than us?

Many times it's subtle, but some people are just living through bigotry day in and out. They just can't stand you. And it becomes visible easily.