To a ricer, it doesn't matter if you're racing, or if you even knew he was there...
I've had ricers do fly-byes while I've been eating french fries in the car just paying attention to the road.
They let me know I was racing when they cut in front of me and hit the hazards....
__________________
Uncle Sam
"What the hell is up with all the gauges?
Calling Captain Kirk, your ride awaits... Phasers on stun...."