I had a weird unpleasant experience I will share. I ride for pleasure on the rural roads in my area. I ride a "racy" bike but I am slow and don't worry about it. I ride with another guy sometimes who has been riding for several years but would never consider racing (I have raced quite a bit).
I noticed some months ago that his speed increases a bit and he always pulls ahead of me when we see another person not in a car. This would include people going the other direction and joggers etc.. We don't see a lot of other people however. In two years of riding we "caught up" to other riders for the first time.
My riding partner bolted out of the saddle upon seeing the rider (s) on the horizon and took off like a madman. The poor rider ahead was taking a drink when this guy with me swoops out around him riding waaay too close considering the road was empty. I was totally in shock.
I slowed and said "hi" from across the road but I should have apologized. I gave the guy a good talking too and tried to make him understand what it would be like to be the other guy. It got pretty angry and made my point..