During math today one of my friends and I were talking. I went to crack my neck but changed my mind and run my hand along the side of my head to the back of my neck. She saw me do this and started looking at me weird. After a while she's said "Is there something you're hiding from me?", I honestly replied that there was a lot I was hiding from her. She got a little edgy at that but continued to talk. Eventually she's said that what I did was "A guy move" and asked if there's something I wanted to tell her. I asked if she thought I was trans, she said "Yes, are you?".
Can someone explain how she got that idea from that action? Cause honestly I have no clue.