Rudeness is immaterial.
The Pitts was wrong to do what he did without notifying the other aircraft already lined up. Without calling, he doesn't know if the aircraft behind him is already at max throttle and about to overtake him.
Now, with a call, I've got no issues with him.
There's nothing wrong with doing something non-standard, as long as appropriate deconfliction and comms are used. Without them, though...