Everything. Guy's a prick.
Specifically, he's a huge narcissist surrounding himself with yes men to stroke his ego. Not a good environment for push back (resulting in obvious failures like the Cybertruck, Twitter-to-X rebranding, 'FSD is ready!', The Boring Company, etc.)
> why is punishing Elon by boycotting Tesla worth slowing the transition to sustainable transportation?
Even if we take the Elon factor out of the equation and just decide not to buy a Tesla for any other reason, it isn't 'slowing the transition to sustainable transportation' because I can buy a (much of the time) cheaper, better build quality, modern electric car from Rivian, Hyundai, BMW, Volkswagen, Audi, BYD, Volvo, Ford, Lucid, Buick, Cadillac, Chevrolet, Chrysler, Fiat, GMC, Honda, Jaguar, Kia, Mercedes-Benz, Nissan, Polestar, Porsche, Ram, etc.