I was lining up for female restroom at McDonald's in London back in 2013.
The line was pretty long. A guy came up to me and told me that I was in the wrong line, he pointed where male restroom was. I gave him a weird smile and told him that I’m not a guy. (it was very awkward for me to actually say it) He was surprised and just walked off. The lady behind me laughed a little and told me to just use the male toilet because there was no line. I told her it’s ok and that I could wait.