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I'm at GSFC, and arrogance is definitely not a character trait of those on my team. Earth science may select for a different type of persona.

For the sake of completeness:

I don't work at NASA, and I know a few arrogant people who also don't work at NASA.

Now the question is, is he wrong? Or are you proving his point? If he is indeed correct your post could still be true seen with your eyes.

If my personal experience is helpful to those trying to answer those questions then great, but I don't know the answer to them.