Something unpleasant happened; am I being a "kkondae" (old-fashioned/condescending)?

I will describe the situation as objectively as possible using concise language.
There is a smoking terrace on a middle floor of a 10-story office building.
To go out to the terrace, you have to open the door.
A female employee in her 20s was walking toward the door from the opposite side, so I held the door open for her out of politeness (I don't know her).
However, her phone rang, and she answered it. For about 30 seconds to a minute, she just hovered near the door without passing through or moving aside. I was left in an awkward position, continuing to hold the door.
Just as I was about to ignore it and move on, she hung up and came back toward the door, so I continued to hold it. I naturally expected at least a brief apology or a word of thanks. Instead, she brushed past me as if I were invisible and just walked by without saying a single word.
So, I stared at her with a very sour expression. I was actually very offended. Perhaps she felt the tension, because she turned around to look at me once before walking on.
This is the factual account of what happened.
Am I being a "kkondae" for feeling offended and annoyed?
I feel quite bad about this.