This strikes me as a nerdism. If you don't find less intelligent people easier to manipulate, you must be working on sympathetic models of them instead of causal ones. I expect that experience would cure this, and after a few months of empirical practice and updating on the task of reasoning with fools, you would find it was actually easier to get them to do whatever you wanted - if you could manage to actually try a lot of different things and notice what worked, instead of being incredulous and indignant at their apparent reasoning errors.
I agree with the Vassar-homonculus, but I took as the point that "reasoning with" may be the wrong tool - not that reasonable practice will fail to suggest the most effective hooks for manipulating the unreasonable fool.
Y'all know the rules: