Hard-core bicycle riders are easy to spot, once you know what to look for. The skin-tight clothing reveals that they look to be so thin as to seem not much wider than the bicycle they are pedaling. Their clothing is covered with the names of bicycles costing several thousand dollars. You usually see them hunched over their handlebars, staring at the road ahead as they keep a steady rhythm of pedaling.
What I've learned about these folks is that they are typically unfriendly and standoffish towards other bike riders. Motorcycle riders usually wave at each other when they pass. There's a certain camaraderie shared when you encounter another person willing to take the risks of riding a motorcycle in traffic. Not so with the hard-core bicyclist. I always wave as I pass. If they even deign to look my way, the most I get is perhaps a finger raised. But even that much is unusual. Last week I waved at a pair of fellow travelers as they rode by in the opposite direction. They merely stared at me as they passed. I had to laugh at the encounter because they reminded me of a couple of lemurs.
I don't know why bicyclists are so unfriendly. I still hold out hope. I'll continue to wave when I pass them by.