Why did the Burmese hate George Orwell?

In "Shooting An Elephant," Orwell (or the narrator) is hated by the Burmese not for himself as an individual but for his official position in the colonial regime. As he puts it in the opening of the essay:

I was hated by large numbers of people – the only time in my life that I have been important enough for this to happen to me.

He is disliked because he is a sub-divisional police officer in the British empire. He notes that hatred against Europeans is running high.
The essay is centrally concerned with the dehumanizing effects of imperialism—a system in which a more powerful country takes control of another country—on both the ruling-class British and the native peoples of Burma. Everyone gets caught up in a system of evil that forces people to behave according to type, not as individuals. The narrator, for example, feels forced by the system to play the expected role of a take-charge leader, even when it means shooting an elephant that is no longer dangerous. The elephant suffers and dies slowly. The narrator acts against his own individual reason and humanity merely so the British can save face.
Orwell uses this essay to condemn the cruelty and irrationality of imperialism.