On probably a dozen occasions, I’ve had people in cars taunt me by yelling some version of "Lance!", "Hey Lance!" or "Go Lance!" at me while I am riding my bike. It seems to be particularly likely if I’m wearing spandex.
Indeed, the "verb" to Lance has an Urban Dictionary entry and there is a Facebook group for Yelling "Hey Lance!" when you see someone riding their bike.
My friend Seth pointed out — after we were (collectively?) called "Lance" in California — that it’s pretty strange to insult somebody by comparing them to a man who is nearly guaranteed to be on any list of greatest living athletes, in any sport.