Sounds to me like a lot of unfounded personal biases and bigotry. I'd be curious to hear some logic.It is a personal observation in regards to the cognitive bias of the cooperate American culture vs the East Asian. The western cultures cultivate a sense of independence, self-reliance, ego-inflation, narcissism (3/7/8ness), whereas Asian cultures (specifically Japan, Korea, Singapore) promote (1/3/6ness) due to the collectivistic nature. Asians are generally more likely to make situational attributions less likely to make dispositional dispositions (Na & Kitayama, 2011). Although the Enneagram type is a result of the neurological dispositions, I believe culture has a influence over how the individual develops as well.
8s can admit their own mistakes, but what if someone accuses them of something? Are they as receptive whereas to 9s or 1s? What I mean is that, 8s have a stronger Ego defense mechanism that rejects and/or denies information that can potentially disempower them.
As an example, I don't need your opinion for my power base. I don't count on someone giving me power.
My golden ideal is TRUTH. I give truth. I value Truth. I very much appreciate people who GIVE me truth.
An unhealthy anyone doesn't like to be criticized. Most healthy, mature people want to improve themselves, and well meant Truth is welcome.