I'm not sure which interview you watched, but the one I watched Tony was smiling and talked about how proud he was of his crew. Saturday he was 27th quickest and finished 2nd. He also gave a TON of credit to Goodyear for the tires that they brought. Granted, he never once commented on Jr's win, but is he supposed too? I'm not sure I understand why or how you're getting that Tony was disappointed..... Any time Tony smiles, he's happy.
Direct from Yahoo sports about Dale Jr living up to Dale Sr. and the fans expectations:
The truth is Junior isn't nor has ever been overrated. If anything, the critics' complaints that he is a crappy driver is misdirected anger aimed not at Earnhardt, but rather at preserving his father's legend.
Junior will be the first to acknowledge that he isn't his father and that he owes his popularity almost entirely to his dad. Sure, he has more fans than he otherwise would, but he was still an 18-time winner throughout the entire losing streak, a number that puts him in the Hall of Fame conversation.
Another direct quote from Tony Stewart, he is simply a sore loser and jealous of Dale Jr's popularity:
Oh, there will celebrations across Junior Nation now that their driver's 143-race losing streak is over – "National holiday tomorrow," Tony Stewart said as Junior took the checkered flag – but just as he's done throughout these four long years, Junior won't get caught up in it. When he hopped out of his car, he immediately thanked his fans – "They stuck behind me for all these years. I appreciate their loyalty," he said – but going crazy over one victory isn't in his blood, not when his daddy won so many races and a championship is still the ultimate goal.