Left-footed

Last evening, after arriving home from dinner, our family decided to take a walk. Our neighborhood has a small green belt with a walking/biking trail through it, the air was cool, but not too cool, and it just seemed like the right thing to do.
Our six-year-old, Davis, wanted to ride his Razor scooter. Donning his bike helmet, he did so, coasting ahead or behind us, as his pushing and balancing allowed.
At one point, while he was ahead of us, I noted his problem keeping the scooter fully upright while pushing. I thought it might have something to do with the fact that our normally right-handed son was using his left leg and foot to push the scooter along.
I verbally made note of this observation, and suggested he try switching his feet, placing the left on the scooter and pushing with his right. He tried this for a few moments, felt it was worse than before, and switched back.
My wife, thinking along the same lines as I, remarked that he hadn’t really given the right-foot push enough of a try. His reply?
“I’m just left-footed.”