I am not sure what the goal is of some of the posters. Do you want him punished for being an irredeemable person? Do you want to send a message? Do you want this to be made less likely to happen?
I think the only possible achievable outcome is to eliminate the behavior, which over time can influence beliefs.
It is possible to at least change behavior. If the NBA mic'd up Larry Bird and Michael Jordan they would never have been able to play the clips without bleeping. Now the NBA is strict about all cursing on the court since every front row fan has a microphone. It is incredible the progress made. In the G-league, or summer league if a guy isn't corrected for cursing it is taken as a sign the organization thinks he won't make the NBA. The behavior has changed. Now down to high school kids cursing on the court is seen as small time.
I taught ESL for 20 years. Was I going to get all my Arab students to see Jews as people? Or the kids for the People's Republic to not see any religious person as not standing in the way of progress? But you can get kids to not say those things, or face consequences. There is tons of research showing the punishment does not need to be strong, as long as the prohibition is clear to not only change the behavior, but to begin to change ideas. Simply put a reasonably smart kid can see an entire society where people find a certain statement highly offensive to question that belief. If you go too far, it can backfire, and you get people from the outside and even the offender beginning to defend the statement, then you have trouble in River City.