If someone is going to browse all then they should be aware that they are entering different communities and be respectful of those communities. If they are disrespectful, whether it is a result of being unaware or just not caring, in my opinion that should warrant an immediate ban pending a demonstration of understanding and admission that what they did was wrong. Unfortunately even that might not make a noticeable difference since many of the disrespectful people are probably not repeat posters. Beyond that the only thing that I’m aware of that could really be done is making the community private which is obviously not ideal. Perhaps there could exist some middle ground of a community not being private but also not appearing on all but I’m unaware of if that’s possible or if it would even be any better in practice.