And hey look - I would imagine that Tiger isn't one of the more popular players on the tour. For one, he, more often than not, beats these guys regularly. For two, that's his edge, which he has said he gets from his mom - that 'stomp them into the ground' mentality. For three, I would imagine his time has to be strictly managed...it is entirely possible he was late for some appointment when he saw the package of stuff Rocco wanted signed & thought 'Aw geez...I ain't got time for this' and just signed the pic & dashed. Keep that in mind - he didn't totally blow off Rocco...he did sign the pic.
One of the common traits of the elite players of any generation is their aloofness. Hogan had it, Snead...even Jack to a certain extent. I think Jack even said he didn't want to be buddy-buddy with the guys he was trying to beat, as that would affect what he was trying to do - beat them.
The only exception to this seemed to be Arnie. By all accounts Arnie was a guy other pros wanted to do beers with. But, Arnie even admits that kind of attitude cost him some tournaments. Case in point, telling Billy Casper on the 10th tee at Olympic when he was up 7 shots with 9 to play in the 1966 US Open that he would doing anything he can to help Billy finish second. Well, he helped Billy win the damn thing. (and BTW...what the hell could Arnie have done to 'help' Billy finish second? Take out Ken Venturi's knees or something? I always found that phrase curious.)