One important point made is that leaders should build environments where people aren't afraid to look stupid. I worked at a place where a senior developer would

One important point made is that leaders should build environments where people aren't afraid to look stupid. I worked at a place where a senior developer would laugh after "winning" an argument with me[1]. I have to say that's the only work environment where I wanted to punch a member of my team. It was also the environment least conducive to dialogue and learning. Even if you're right and the person is genuinely being stupid, you don't need to rub it in. Chances are they'll already feel stupid from their own judgement. [1]: A lot of our arguments boiled down to us debating stuff where neither of us knew what we were talking about, but I was the only one willing to admit that.