You're confused about how the dickhead non-dickhead spectrum works.
From the viewpoint of a dickhead, an honest and intelligent person is a dickhead. The honest and intelligent person has the potential to expose the dickhead as a dickhead, so the dickhead will do everything he can to convince everyone else that the honest and intelligent person is a dickhead.
A dickhead would see an honest and intelligent person as a dickhead, and be able to lie convincingly enough to establish it as fact in the eyes of others.
In fact, a highly skilled dickhead can convince an honest person that "standing up for yourself" is a dickhead behavior.
I have no way of telling if the OP is a dickhead or not, because I haven't met him. My guess is "not a dickhead, he was just convinced by dickheads the he actually was the dickhead".
So, he learned to act in a manner least likely to offend dickheads. I don't want to work with dickheads, so I don't bother with that skill.