I worked at a company that had someone who acted like this (irrationally stubborn on design choices without providing data or reasons, having emotional tantrums

I worked at a company that had someone who acted like this (irrationally stubborn on design choices without providing data or reasons, having emotional tantrums and just generally super sensitive). I liked the guy -- but everyone started ignoring him and then actively excluding him from all the business processes. Not inviting him to important meetings. Eventually he got assigned a new project that was shortly "canceled" after and he was let go as being "redundent". Fortunately, he got 6 months salary for leaving-- and time to find another job -- so I'd say it ended ok in that case.