[tremon]

The sheer quantity of anti-American rhetoric online

The only way to make a great country greater is to acknowledge its flaws and strive to correct them. The default mode of communication seems to have been people pointing out US failures, and US people widely shouting them down, regardless of the merit of the claim. That has also been a major factor driving anti-American rhetoric, you can't blame that on foreign influence.

Or, in other words: anti-American rhetoric coming from American citizens is a good thing: it makes the country better.