Earlier quoted context omitted.
Everybody likes the "in-group" and hates the rest. Although the word hate tends to mainly be used about other people.
Absolutely not. You are implying that hating people based on something they cannot control (e.g. ethnicity) is normal.
That said, since you bring it up, the history of humanity is largely the history of war between different ethnic groups. So yes, hating people based on ethnicity has been the norm for most of human history. It's still largely the case in varying degrees in different parts of the world.