You have to be OK getting rid of productive assholes that mess up this culture. The hint of a senior not being open to criticism will instantly halt any ability for a team to have a safe, open dialog.
In the 18 years since I graduated (I feel old), I have seen some people easily carry entire projects while demotivating everyone around them… and also colossal idiots who were just as confident and unwilling to listen.
I really hope I never end up unable to listen to critics.