(Mostly just being cheeky. It's not fair to judge people on the internet when you don't know them)
I read the article title and wanted to see how accurate it was.
If it was accurate, it would cause me, like a rational creature, to question my tendencies. I have list of pros and cons for all my proclivities and try to use/taper my tendencies accordingly. It's not like I'd abandon my tendency toward pessimism all together, but adding something to the list of cons would put it's utility into greater question. I'm always questioning my beliefs and the utility of my tendencies, it's how I constantly improve and progress in life.
But I also question other peoples assertions. It's the natural thing to do for me. I think to question how they define pessimism is also quite logical when trying to objectively measure something.
I'm curious though, can you please tell me how I was complaining? I'm genuinely interesting in knowing why you perceive that.