Last week, I dressed up in a suit and tie, went to the work, and went to the nearby coffee shop afterwards. The cashier who took my order was super friendly. She asked me what school I went to, smiled a lot, and when I got my order, she cleaned all the tables near where I was sitting. She stayed really close to where I was sitting for a while until the coffee shop got busy again.
My first reaction was wow! She's a really friendly and hardworking person!
I went to the restroom before leaving, and as I'm leaving, this girl says, "Bye, [my real name]!" I look back, and I say goodbye as well but I noticed that she looked super pissed. I honestly didn't know why, so I just went on with the rest of my day.
I'm a painfully average dude, so I rarely get hit on by women. I'm also pretty oblivious and naive in a lot of different ways. Was this girl mad that I didn't ask her out? Or am looking too much into this?