1. Confidence at someone else's expense. 2. From a lack of empathy or consideration. 3. I think it's largely due to deep rooted insecurity (maybe in other are

1. Confidence at someone else's expense. 2. From a lack of empathy or consideration. 3. I think it's largely due to deep rooted insecurity (maybe in other areas than their strengths). 4. I think it is always bad. I don't know how you can avoid it aside from self-reflection.