The strangest part of that article is this:

  I understand how ingrained the “guys” habit might be for 
  some of you. It was for me. After several months of 
  concerted, conscious effort, I still slip and say it on oc-
  casion.

So even the author herself used the word with completely gender neutral intent, but then she insists that others can't. It's like she's looking for reasons to be offended.