Get the N number of that plane and report it to the FAA that is a clear violation of FAR 91.119 it's idiots like that give all sport pilots a bad rap. At 100+ mph any distraction and 50 feet is going to be a disaster looking for a place to happen.
I want to go up again at a lower altitude and do a 360 degree panorama of the whole lake. The problem is the west end is in the flight path of Hemet/Ryan airport and without a spotter or someone else taking pictures it puts one at a risk.