What Forster had against colonialism was its corruption of individual relation, its destruction of personality

What Forster had against colonialism (since he was a novelist and not a pamphleteer) was its corruption of individual relation, its destruction of personality. What irked Forster about the Raj was that it turned a silly Indian like Aziz into a martyr and a silly Englishman like Heaslop into a tyrant, and neither of them were fitted for roles so important.

J. Cameron, An Indian summer (1974), 110

I expect that is what irked Forster about colonialism, but it's not what I'd put top.