On the point of civilised behaviour in cabin I would refer back to safety training we once had, which basically boiled down to consider the safest course first and then do it!
Some people are a bit boisterous, but will accept a caution.
Some are downright unreasonable and often are also the best dressed, and apparently the last people from whom you would expect it.
As a pax - leave it to the crew. hopefully their training and authority will have the desired effect - if it doesnt the presence of some dark blue uniforms at their destination hopefully will.