When I write papers, and more generally in all of my conduct within academia, I follow a cardinal rule: Be Nice. I cannot imagine being negative towards another

When I write papers, and more generally in all of my conduct within academia, I follow a cardinal rule: Be Nice. I cannot imagine being negative towards another paper in one of my own. On the other hand, I'm a mathematician, and I very rarely (i.e. never personally) see incorrect papers from others in my field. I will also add that I've been quite negative when reviewing papers. But that occurs behind closed doors (for good reason --- even good people make dumb mistakes sometimes).