To the older man in the dark red mid-nineties sedan in the parking lot of the Billings Bridge Mall this evening:
When a cyclist extends her left arm out to her side, that is a turning signal. It indicates her intention to turn left, and as she will be at the rightmost side of the road, that means she will cross your path in the execution of said turn. If you are behind her, you are expected to slow up and allow her to complete the action she's signaled she's about to undertake.
If I'm expected to know the rules of the road, and the signals and signs appurtaining thereunto, then so bloody well are you.
And don't you shake your head at me.