“In the book, you talk about having been a trio with two other girlfriends who got married at the same time; as all of you guys saw it to some degree, they’d moved on together, leaving you behind.”

—Jia Tolentino, http://jezebel.com/marriage-changes-when-you-dont-just-need-a-warm-body-an-1762007106

 
As much as I enjoyed this article, I have a real problem with this language. Perhaps younger people would have no issues with this, but, as a middle-aged woman, I have a serious problem with being addressed as a “guy.” Think about it.  A “guy” is a colloquial term for a young man.
If you are addressing a group with women in it, be careful that you don’t address the group as “guys,” especially if you are trying to sell something, whether that something is a product, a service, or the fact that you are a credible authority about whatever it is that you are speaking about. You could say “you,” “you all,” “you folks,” whatever, but don’t call a woman a “guy.” I ain’t no guy.
And boy, oh, boy, do I hate being addressed as one!