First, no relation to EAL, never met him, just looked at some of his stuff, and luckily I never even knew there was a "Sia"
First thought, every filmmaker type i've known in high school & college was a creative character, big ego, self centered, easy to debate but hard to persuade, on their path regardless, sort of perceived as necessary traits to succeed in such a tough competitive business where everyone is a critic... and it used to cost a lot of $ for film and cameras...
Entertaining, but so are a lot of folks. Would I play with him? I don't have to meditate on that!