I'm part of society. I know that it is no longer the year 1650. Celebrations of Life are a thing now. I can show you memorial pictures of people laughing, joking, celebrating, dancing, showing peace signs and giving each other high fives. Again, who exactly is giving this rule that it is inappropriate to celebrate at cemeteries or memorials?
The closest rule the ANC cites against using photography for political purposes refers to the Hatch Act for how federal employees may conduct themselves - "'Additionally, ANC will not authorize any filming for partisan, political or fundraising purposes,' citing the Hatch Act, which governs how federal employees can weigh in on political activities."
Federal employees may be limited by the Hatch Act in their political speech (with threat of dismissal or civil penalties, not criminal penalties), but not private citizens. Receiving presidential pension benefits doesn't make Trump a federal employee. He also never agreed to follow any rules in relation to that. The only employment contract a President agrees to when taking office is the famous oath of office of the president of the United States. There is no employee contract which says that the President will agree follow x rules upon taking office, for obvious reasons.
Incidentally, this is also why you guys think that Trump was constantly breaking rules during his reign. You just don't understand that the President makes the rules for the Executive Branch and that, outside of what the Constitution says about the presidency, no rules apply to the President. The position is not a regular employee.