I don't think the British empire was "uniquely nefarious", but I think most of the indigenous people of the places that they colonised experienced it as being _fairly_ nefarious! I'm not aware of many former colonies celebrating Colonisation Day or bemoaning the withdrawal of the British Army from their territories.
Even one of the most anglo-friendly and prosperous former colonies, the USA, didn't have very nice things to say about the Empire when they were a part of it.
Even one of the most anglo-friendly and prosperous former colonies, the USA, didn't have very nice things to say about the Empire when they were a part of it.