A few years ago, I had a guest who booked one of the private rooms in my homeshare. However, when I showed her the room, she made a strange face, which is not the reaction I usually get! I asked her what was wrong and she said, "This is not the room I booked." I assured her it was. "No," she said, "I booked the pink room."
I explained that I did not have a pink room. Maybe she was thinking of another listing she looked at while searching? No, she insisted she booked a pink room at my house. So, I asked her to show me the listing she booked and the photos. She searched on her phone and showed me the pictures.
I then went on to point out every corner of the room and how it was exactly the same as the pictures, bar the bedspread, which was gold on the day she checked in (not lilac as in the photo). She admitted that it was indeed the same room and that was the end of the discussion.
While I can imagine that the room might appear slightly pinkish depending on your screen/monitor, I can assure you that the room was almost exactly the same as in the photo the guest checked in. The only difference was the bed linen, and naturally I have more than one set and update sets due to wear and tear.
Some guests are just clueless I am afraid.