Rent Party says:
One of the things I find insulting from such individuals is that they not only take such great advantage of my kindness but that they so underestimate my intelligence.
They are just failing to conceptualise your intelligence. They don’t have a working theory of “other minds” — which is quite a common lack in this post-humanist era. (Postmodernist decentering contributes to this soul lack.)
So, whereas they can SENSE your intelligence, they are afraid of it, and don’t know what to make of it. They do not see it as a feature of your whole being, but rather as an unpredictable upsurge of self-directed spontaneity entailing ideas, while knowing not from whence they come. So, your intelligence is felt as a danger to them, something to be batted down, or dealt with manipulatively in the moment. It’s not that they are doing this because they think you are an idiot — but because they fear that you are NOT(and that your thinking, if it pursues its current stable path, will start to overwhelm them.)
They believe that they are justified in treating you in this way, because they are catering to their fear and doing it in self defence.