Here are possible solutions:
1. Video/photograph the guy in action and have a private discussion with him about the issue/concern and show him your video/pictures.
2. Have a private discussion with the dive master, boat captain, organizer, shop owner, etc. to let them know of the issue and your concern, and let them handle it.
3. Sureptitiously obtain the guy's camera and throw it overboard never to be seen again. This should reduce the amount of taskloading he is experiencing and will hopefully improve his diving.
4. Ask to see his camera and then feign a stumble to cover tossing it overboard never to be seen again. This shouldl reduce the amount of taskloading he is experiencing and will hopefully improve his diving.
5. Dive with blinders or in a different area/direction than the guy. I don't condone touching/breaking coral but unfortunately there are a lot of boobs out there that despite their training and knowing better will still dive in a reckless manner either inadvertently or for personal gains such as getting the photograph....this is not specifically a new or taskloaded diver issue as I have many times seen folks who have lots of experience with big fancy camera rigs grab onto whatever they decide to so that they can get the shots they want. Unfortunately, unless you plan to play the role of "Ocean Police", you are better off creating situations for yourself where you are unaware of the damage/destruction that those boobs out there are doing.
AND yes I know that recommendation #5 does not fix the "problem", and it still leaves behind a path of destruction that affects the greater diving community, but one has to decide for themself what windmills one is going to tilt at and there are lots of things before and after one splashes that affect the health of the reefs and the oceans....one could argue that our very presence diving around a reef is somewhat invasive and destructive....some of that destruction is not visible otherwise apparent during an actual dive. Is some destruction more acceptable than others? Is some less acceptable because it is more immediately apparent? One has to evaluate this, do some personal rational calculus and decide for themself what is acceptable.
-Z