Darling you just need to make your own steemit.chat using rocket.chat software and then you can have your own group that says what you want them to say and adheres to the code of conduct you may wish to see.
The cool thing about blockchain tech merged with a blockchain is that it cannot be censored. So there is little way you can control the behavior of an evergrowing userbase. It would be like telling trolls to stop trolling.
Though I appreciate the intent of your post, I believe it is a moot point and that you are better off pushing forward with your vision and competing with others instead of warning them or telling them not to act in such ways. I suggest rather than listening to the "trash" (which is probably pretty true), just make your own group that makes you happy and upvote eachother's content. That easy....
Boom, best answer.. this needs to be upvoted