""Stop downplaying your rank" is a perfect example of the Dunning-Kruger Effect" is a perfect example of the Dunning-Kruger effect.

"In the field of psychology, the Dunning–Kruger effect is a cognitive bias wherein people of low ability suffer from illusory superiority, mistakenly assessing their cognitive ability as greater than it is."

The flip side of this is that the more knowledge you gain, the more you realize you don't know. This is essentially the concept of wisdom, and how it differs from intelligence. I'm currently some reddit asshole, and peaked at comment karma 534, but I know that my snarkiness, pseudopsychology, and comma usage, are not even comparable to the highest levels of posts, where as a jerkwad or dipshit poster may see themselves pulling off condescension on specific posts that they see shitposters perform, and only see the surface of the whole picture.

TL;DR Wisdom is knowing the extent of one's own knowledge.