While I agree with Fuller, one needs to save comments for the diplomats. But, I do not think he should have been fired over this. This sounds more like a "straw that broke the camel's back" kinda thing in regards to his firing.
The Afghan war is also a psychological war and we are losing on that front, horribly. I attended a seminar in which an officer that was conducting "PR" with Afghans in various areas of the country. You have to be very careful about how you word things and timing is everything.
The Taliban spread word that they had taken over New York City and the population in that area believed them. Some people thought that America was over a neighboring mountain range. Others did not know of America and thought the US soldiers were Soviets returning for revenge.
Trying to "colonize" Afghanistan didn't work out so well for the Soviets...
I think he is referring to the old definition of colonization. You build settlements of your people within a newly acquired territory and displace / remove the people currently living there (indigenous population) whose ancestors did the same to the previous inhabitants. AFAIK, the Soviets were not doing this (they were supporting the Pro-Soviet government in Kabul).