One word Advantage. I can pull your shirt all day but if you are able to still play the ball ( cross it , pass shoot ) then a lot of time the ref will allow play to continue. It is a foul but again most times the ref will let play go on. The kind of play you will see more and more.. The older he gets the more physical it tends to be.....if you happen to get an experinced ref it can make a diff ... but this is the way the game is played more times than not. Tell him to fight through the hard play and he will be fine.