You can make fun of him all you want. I don't see anything wrong with stepping into the pass from the ref and shooting a jumper. If you can replicate the shot, who cares? There isn't a right and wrong way to shoot a free throw. If you make it who gives a damn. Rick Barry for example...
Actually you could argue Rick Berry is one of the few players in history who shot free throws the best way possible. Granny style provides superior arc and spin, especially if you are a big man. Only reason not to do it is pride.