The long version...I forgot about a sippy cup of water in my diaper bag. Since I'm against the idiocy of liquid testing, I asked to toss the water instead. The screener took the cup out of my view to dump it, so I asked her to please toss the entire cup. She surprisingly understanding of that request, but when I asked her why she didn't use one of the 6+ garbage cans within view, she asked me how I'd like to empty garbage cans full of liquid. I told her it was an airport, and the garbage can were probably all full of liquid from drinks that people dumped. She didn't like that answer, and gave her response from my original post.

But, like I said, I hadn't even been through DFW the week before, and I very rarely have interactions with screeners. I remember the screeners I do have issues with...she was not on the list before this.