Today, a welcome pop up was rolled out to users in chat:
This is useful, but I feel as though it would be even more useful if room owners could use it to specify what was and wasn't allowed in their room. Encouraging users to flag something just because it makes them feel "uneasy" is going to greatly increase the number of out-of-context flags, leading to decisions being made by mods and 10k users from all over the site, who have no idea of the atmosphere of the room, and no context with which to make their decision on the flag.
Furthermore, this could be another tool to help with keeping rooms in line, by giving the room owner an ability to force the message to pop up for everyone currently in the room, reminding them of the rules.
As much as people might wish it were so, not every room has the same idea of what is acceptable and what is not, and I think that trying to treat them as if they do is just going to lead to problems.