It's most likely a reference to the unpleasant CS thread:
https://forum.freeadvice.com/child-support-98/hes-full-right-540612.html
The ladies on that thread (and they ARE ladies, in every sense of the word) most likely receive CS. They deal with NCPs (most likely) who constantly bitch about how they are "sucking X dry" or aren't using it properly.
Essentially, they most likely deal with over-controlling, petty arseholes, who seek stringent accounting over every last dime of CS they receive. Women who make sacrifice upon sacrifice for the best of their children ~ and those sacrifices go unnoticed, unappreciated, etc, by said bitching, whinging NCP.
Often, said NCP takes more time and trouble to bitch about said CS and the spending of such, than NCP does asking after their children's welfare.
Typically, such single women that sacrifice for their children get a tad bit testy over such skewed priorities. If she doesn't bitch and whinge about the sacrifice SHE'S making, why do you think she'd be happy to hear YOUR bitching over having to send in a few $$ a month?
Simply put, you said the wrong things to the wrong people.