He will regret that, such a simple thing which would have cost him nothing. Pushing the lad's arm away was the height of bad manners.
There's probably some R&A rule that says until his signed playing card is properly submitted and checked, he can't sign anything - in case someone slips him a different card... Unlikely, but seeing some of the R&A regulations, they are like a non-corrupt version of FIFA....
Wow, just found out that I was right!! Ian Poulter has tweeted that R&A rules say no signing anything until after the scorecard has been handed in...