As a colonial British police officer, Orwell is cordially loathed by most of the Burmese people that he encounters on a daily basis. To them, he is little more than an oppressor, a tool of an imperial system that exploits them and deprives them of the land that is rightfully theirs.
As a consequence, Orwell is treated with open contempt and disrespect as he pounds the beat each day. The worst offenders are Buddhist priests, who seem to have nothing better to do than hang around street corners jeering at Europeans.
Orwell is conflicted about all of this. On the one hand, he hates the British Empire and all it stands for. He is thus secretly pro-Burmese, even though, as a colonial police officer, he can't come out and express his sympathies openly.
At the same time, he can't help feeling that it would give him immense joy to plunge his bayonet into the guts of a Buddhist priest. It would appear from this that imperialist attitudes to subject peoples are difficult to eradicate. Orwell tries to rationalize his violent feelings by saying that they are the normal by-products of imperialism. Apparently, any Anglo-Indian official will tell you this when they're off-duty.