This is feedback for the content in the answer by Chair.
I think several of these points are well-intentioned but either overshoot their intention or make a point not actually in line with what is current practice in the room:
Some things are meant for other rooms: Meta-issues are frequently best off in the Physics meta chat room, and homework-like questions are more welcome in the Problem-solving room. The meta room is quite still, so you'll probably need to ping a person you'd like to talk to, and the problem-solving room has a few requirements which can be read about here. That being said, there's no requirement that conversations in the h bar must be about physics.
Remove the explicit mention of meta issues or the meta room. Meta issues are just fine in the h bar, as long as they don't drown out any other conversation, like any other topic. The meta chat room has always been used as an overflow room - i.e. a room to shift a meta discussion to when the h bar was otherwise busy or the discussion went on for a very long period of time - not as a "room for meta issues".
Avoid sensitive topics: These can range from local stuff like suspensions of users on Physics SE (which the mods here prefer to not discuss in public and is bad form when the user can't reply), to broader issues like politics, sex, and religion. They aren't strictly off-topic in the room, but we try to avoid them.
Split this into two parts. This point lumps together things which don't belong together. That we discourage discussion of suspensions and overly and/or unduly negative discussion of other users' behaviour is indeed a rule the moderators have adopted, and such discussion should indeed be avoided. However, discussion of other sensitive topics should not be avoided as such - you should just be especially certain that you discuss them in a respectful and considerate manner, and that you should be more than willing to drop the issue if someone expresses their discomfort with the topic. The canonical network-wide post on political discussion in chat is here. The bottom line is be respectful, not "don't talk about this".