He came into my class to teach do a guest lecture. Rambled incoherently about space and with bad science then tried to turn it inspirational and gave up after 15 minutes at most and left unceremoniously. It was a waste of time for those of us there to study physics.

And then he was a guest speaker at an event, absolutely took over and made the night entirely about him. Was a douche about water straight up called me a moron in front of hundreds of people because he asked a question poorly and I lowered my hand.

A professional friend in the planetary science space who is far to old to be a fan, hates him from a birthday party for ray bradbury so he's been a douche for a while and not just to fans