(Not that it matters, and this is more of an "I dunno." type answer, but figured I'd post it anyway for anyone who may be interested in seeing it.)
Source
The part about grudges was:
Q: Your in-the-ring relationship with Dwayne Johnson isn’t always smooth. Do those kind of grudges carry over out of the ring?
A: A lot more than people would think. People think it’s one big happy family, but attitude and egos do get in the way.
Full Q&A session can be read here.
John Cena was asked during a recent Q&A with AZCentral.com on who he would be rooting for in the match between The Rock and CM Punk for the WWE Championship at this Sunday's Royal Rumble pay-per-view event.
"I'm torn," Cena admitted. "CM Punk has been the champion for quite a long time now, but I know from my past instances with Dwayne Johnson that he's very difficult to beat."
Cena also admitted that grudges carry over outside of the ring "a lot more than people would think."
Source
The part about grudges was:
Q: Your in-the-ring relationship with Dwayne Johnson isn’t always smooth. Do those kind of grudges carry over out of the ring?
A: A lot more than people would think. People think it’s one big happy family, but attitude and egos do get in the way.
Full Q&A session can be read here.