To be fair, I suspect that it is because you are both riding decent bikes and are clearly good cyclists. People, and possibly men in particular, like a challenge. I am often "raced" by young men riding hybrids who want to show their superioroty by overtaking a fat old man on a decent bike. I was once a couple of hundred yards from home after a 100+ mile ride when a young man on a hybrid sprinted past me and raised his hands in celebration as he passed by. Whatever floats his boat....
To be fair, I suspect that it is because you are both riding decent bikes and are clearly good cyclists. People, and possibly men in particular, like a challenge. I am often "raced" by young men riding hybrids who want to show their superioroty by overtaking a fat old man on a decent bike. I was once a couple of hundred yards from home after a 100+ mile ride when a young man on a hybrid sprinted past me and raised his hands in celebration as he passed by. Whatever floats his boat....