Sounds like she was a psychopath. Though I'm not educated in the area and am not totally sure of the definition. But the lack of empathy for others is a definite pointer in that direction.

Luckily most people are not psychopaths.

My main problem with giving my opinion on things is that usually I am too good at seeing both sides of an argument. So I don't have hugely strong opinions on most things. And early conditioning has made me less likely to speak up even if I do have a strong opinion on something.

But dalekboy has some good points there. And I should probably remember my feedback/mentoring stuff better and find some good things to say about my students labs.