From his point of view, he's right. Afterall he has every right to be angry for the film turning out to be different than the narration he received before signing the film.
It's a known fact that after being impressed by Srk's performance while filming, Yashji gave more emphasis on Srk's character than Sunny Deol.
Aamir Khan had refused the film only because Yashji didn't agree to have a joint-narration with Sunny Deol. But also it was Aamir Khan who had suggested Shah Rukh to take up the role.
In the end, Sunny Deol getting upset with Yash Chopra is fair. But not with Shah Rukh & even Sunny plays it diplomatically saying he's happy to work with anybody & has no problems. Shah Rukh cannot be blamed because he got a very good role & he gave his 100% to the role. You can't get upset over an actor for acting well.
Excerpts from Aamir's 1994 interview,
Interviewer: Do you regret your decision of walking out of Darr?
Aamir Khan: One, I did not walk out of Darr. I was removed from the film. Two, I was removed from the film because I asked for a joint narration with Sunny Deol. Initially, the director agreed, but later I don't know why he changed his mind. When I persisted, he phoned to say 'Aamir, let's work some other time.' So I said, 'Fine'.
A different version revealed in 2013...
"It was around 4:30 am and I still remember that (ironically!) Aamir Khan, SRK, Gauri and I were standing in Salman's compound when Aamir told Shah Rukh about a narration he heard the previous day. Though he refused the film, he strongly felt that Shah Rukh was perfect for the role and urged him to call up Yash Chopra for the same," Shabina said