I don't think it's ok for Roger to jokingly say that he always beats Andy. It's a sign of disrespect. Roger knows that he owns Andy. Andy knows that Roger owns him. But he doesn't have to say it for the entire stadium to hear. And it's not ok to say it just because your opponent (sort of) laughs.
Well, Andy brought it up first. Anyway, if anything Roger said it as a sign of respect. He mentioned how much he enjoyed playing Andy and, since the natural assumption is that he enjoys it because he usually wins, he said that wasn't the case. Imagine (before yesterday) that Hewitt said how much he loved to play Roddick. What would people think he meant? I imagine Roger likes to play Andy because he's a nice guy, a good competitor, and they have a great deal of respect for one another.
Andy needs to change his attitude. Instead of always post-loss interviewing that "Well, Roger basically whupped my ass...AGAIN", basically admitting that he's never going to win, he needs to come up with a different answer. He needs to get mad and to get the fire going inside. He needs to get so pissed off that he'll train harder, watch more tape, and prepare better mentally.
You don't think he's trying already? As much as I rag on it, his backhand is much improved. He's coming in and attacking more than ever. My tennis kids think I'm the most optimistic man alive ("there's always a chance you can win"), but there is something to be said about realism. Andy isn't giving up by any means, but I think he realizes Federer is just a bad matchup for him. Roger can neutralize his serve, he's more consistent off the ground, and he has a big edge in moving, returning, volleying, defending, and passing. There doesn't seem to be a lot Roddick can do. He's overmatched and, even worse, Federer doesn't really have any weaknesses he could exploit. That being said, I'll reiterate that Carillo is right about Andy needed to move closer to the baseline. He can't give up that much court to Roger.