You could assert the Earth is flat and I'd call it a crap assertion, is that because I don't understand it or because you're making an absurd assertion? You could say that the proper way to recover from a spin in an airplane is to apply full opposite aileron and I'd call it a crap assertion, is that because my many years as a professional pilot lead to my inability to understand or would it be because you're making a crap assertion. We could go on all day with assertions that education and experience lead those of us with experience and education to call crap, again precisely because we understand the subject and you don't. If you call that arrogance, we'll get back to me in a few years and let me know if you still feel the same way. Once again, we have an advantage over you in that we once were you. Funny how both my teenager and you seem to be incapable of grasping that, way of the world for my teenager because of brain development and all, but not strictly necessary for the novice.