So there is a second part to this story:
I have two Yeti cups with my corporate logo and name engraved on them. They are not pretty. One fell out of the back of my truck on the highway and got knocked around by traffic. It has road rash and a good sized dent in it. The other has been thrown in the back of our work vehicles many times and has been banged around by tools and supplies. I like to think of them as having 'character'.

I go to pick up my coffee and tea, and the same lady is right there behind me. "Oh my god, he has two Yetis."
I turned around and gave her the same line I give my employees all the time: "That's because I am fueled by caffeine and rage."
She repeated it twice, then told the beleaguered barista that she was "going to get that one in ink".

I really couldn't get a good read on the situation. One possibility is that it was an awkward public call-out, and that she kept it going because she didn't feel she got the effect she wanted.
Or she felt bad for having the first interchange, and was trying to engage me in conversation to seem normal.
Or she is one of those non self-aware people who wanted a conversation with a stranger.
Or she was hitting on me, in the way of 5th graders.
I really couldn't tell.