[tptacek]

It took 15 seconds. I just typed "poor" into the search bar, sorted comments by dates, and the first comment that used "poor" in the sense that you did easily qualified:

https://news.ycombinator.com/item?id=27320284

It is wildly not the case that the median HN commenter who writes on stories related to economic inequality is biased against marginalized people.

This is a pretty clear instance of what Dan refers to as the "notice-dislike fallacy"; you've noticed people writing callous comments, because they rub you the wrong way (as they do me), but haven't noticed the countervailing comments, because they're boring (to you).