[josefx]

> People can say you're wrong. Check your ego at the door if you give a public talk.

There are probably tons of lectures on how to disagree with someone while phrasing it neutrally. For example "you are wrong" vs. "I disagree with your point" . I couldn't imagine using such a style constantly without slipping up every now and then but it is probably double plus good in an environment that forces you to walk on eggshells.