I have noticed that certain things about cycling and cycling gear reduce one's ability to "read" the emotional state of other riders; Sunglasses mask the expressiveness of eyes, helmets look rather hard and forbidding, mouths are often drawn down in concentration. I know I tend to view "emotionless" behavior as slightly hostile, even though it is hardly ever intended as such-- and I doubt that I am the only one. (Mr Spock was always viewed with suspicion by the crew...) Perhaps that is what we sensitive types are keying in on.