I really dislike the "Nightwing: Year One" version of Jason's origin. I much prefer his original meeting with Nightwing, the one in Batman #416. Jason and Dick argued for a couple of pages, then Jay went all "who is this Nightwing guy again? Wait, ZOMG, HE WAS THE ORIGINAL ROBIN! HE IS BACK AND BRUCE WILL FIRE ME! DDD: ;_; ", and when they next met Jay and Dick got along well and were even friendly with each other.
But after Jason died, all the "flashback" stories portrayed him as angrier than he actually was, and apparently unable to get along with Dick.