There are several ways to answer this. Here’s my version:
1. I am not proposing an RBE at all because no one has a clear definition of that or because it sounds like it is about “resources”, so I migrated towards “a world where trade is unnecessary” because that means if it is unnecessary then it must be an abundance of goods, services, and opportunities. It also means that it is about solving the big problems: waste, corruption, violence, education, etc., and not about telling people what to do. Like I describe in The Money Game and Beyond ebook in detail it is like the goal is tackling aging to solve most health issues, and I don’t care it that’s done through replacing cells, modifying cells’ DNA, the telomeres, and so forth, as long as we keep it about “tackling aging”. Same here: I don’t care if you talk about circular cities, organic food, or whatever, as long as we are all about “tackling trade”.
2. Therefore point two: I or no one else can know what will happen in such a world and cannot try to imagine and solve all such problems like people throwing rocks and beating others, no more than thinking what will happen when people post mean comments on websites before inventing the internet.
3. My guess is that such situations will happen in any society, but again this is about tackling the big issues not these small ones. Though if people ask such questions ask them how are they resolved today. If someone beats other people then it may happen that others will either stop or beat this guy, some call the police and give him a fine, or he may be jailed. In a trade-free world people will have the time to find better solutions for this like avoiding such issues in the first place, and if such situations happen then they may stop this person and try to talk to him/her and resolve the issue peacefully. Who are “they”? I have no clue, maybe people seeing the event, maybe psychologists, maybe a different kind of peaceful police. Who knows what groups of people will form in this kind of society. I don’t think anyone imagined Wikipedia before the internet was invented, let alone the way wikipedia is edited by volunteers. But the goal was “create the internet and give equal access to all then will see how it goes”. Same way we cannot imagine all aspects of this kind of trade-free society.