The OP directed arguments to THOSE WHOM THE SHOE FITS. What that means, obviously, is that the OP is NOT speaking to everyone who posts on CB, but rather, those who are guilty of morally wrong conduct in the things they say. For you to make the point that CB consists of a bunch of diverse points of view is only to re-state what the OP already acknowledged in the very title of his post, and in the body of it as well.

Also, embracing viewpoint diversity is irrelevant to the point made by the OP. Christians, which almost all of us are, don't believe that all persons, regardless of their conduct, are approved of by God and will all inherit equally happy futures. People who write that some coach is an idiot, or that he sucks, or that he stinks at what he does, or is incompetent, are committing moral offenses, regardless of their rights to free speech or individuality. Christ himself teaches that if these people go on that way without repenting, they endanger their own fate at judgment day. They're fighting against Christian behavior. The OP is arguing against moral wrongness, and, inferentially, is arguing FOR using one's agency to change un-Christian behavior, even if it means giving up one's treasured diversity vis-a-vis other, more conscientious, posters.

If someone professes Christianity, he or she must acknowledge that Christ, in the Sermon on the Mount and the sermon to the Nephites, refers to the use of the term Raca, which is roughly interpreted as "thou fool." He uses this as an example of sinful behavior that requires repentance. There's no logical exemption for doing this same type of thing on social media sites, or with the sports-related content of CB.

It's also illogical and irrelevant to disagree with the OP in arguing for the need to "live in the real world." People who call on others to exemplify the Christian morality they purport to embrace, are also part of "the real world," thankfully.