The data collection needed to provide such feedback is inherently prone to privacy violations and exposes safety risks (see what China is doing to monitor social media activity.) Secondly, these feedback algorithms can pull people into echo chambers of disinformation and amplify all sorts of negative feelings and behavior.
Not sure throwing more technology and regulation at the problem is a solution. In the end it will probably require a social shift; a realization that "social media" makes us less social at a deep level while providing the illusion of being social. Paying attention to the person in front of you used to be considered polite. Now it's considered old-fashioned?