Since I got my driver's license six years ago, I've become something of an expert at the non verbal communication of the road. The gesture that means I know you've got the right of way, and I'm letting you have it. The one that means thanks. I smile sweetly, behind my windsheild, and say "It's called a turn signal you moron."
or "That sign said stop, cretin."

If I meet a man whose behavior is iffy, I will be very unpleasant with him. I have my definition of iffy. (The guy who grabbed the hem of my skirt as I was crossing the sixth street bridge comes to mind.) Another woman might perceive a friendly smile as iffy, or a pleasant hello. Her experience may be different from mine.