He clearly was an exceptional scientist, but also likely an a*hole. Also unfortunately when people get older, many people's negative qualities are amplified. That seem to have happened with Watson and has tarnished his legacy.
Who cares? Lots of assholes have done lots of great things. Some of the most important people in history have been assholes.
Especially when the accomplishment is built on basically stolen/unacknowledged work. I’d rather have more Rosalynd Franklin in the world than more James Watson.