"Retaliation means a civil rights complaint": in another reply I have posted how incredibly seccessful a broad-reaching public defamation campaign is.
As far as is known CS has not filed any legal action against DS, be it civil rights, discrimination, or whatever. I suspect CS could get pro bono legal representation in a "#racism" case like this, against a person in a national-level spotlight. But, there is no lawsuit as we know. That likely means that at this point the clearly enraged and motivated CS does not have the evidence, for example: numbler, times and stats of his athlete's performance, dates and events/meets his athlete clearly qualified to be entered into competition but was omitted, missed opportunity to have high level competition results at x, y, z, location and dates of competition, and $$ scholarship not earned due to no results to show recruiters, plus "emotional damages" = suing for an award of $375K or myriad alternate scenarios that show facts, dates, wittnesses. That collection of data would be picked up and utilized by legal representation in a heartbeat.
But, I can't find report of a lawsuit. So CS is voicing online, which is in this era, a universally recognized form of communication. He has a right to do that. The consequence though, it that CS's anti-DS public defamation campaign becomes a an open-water, no rules, destructive machine, and it's free and easily accessible to CS. These public defamation campaigns are very effective: look at how long, arduous trials ending in "no guilty verdict" have still managed severly to polarize the US population when tweets, facecebook, and other social media are utilized, unchecked and unfiltered, by numerous political figures.
The collateral damage of the public defamation campaign, started by the other person named "Gary" is the the destruction of the school running program.
Gary and CS might very well have legitimate charges. If they whould have gone through only through the court or school district for their complaints/grievances, 1) all parties would have immediately had legal protections against retaliation (or "#retaliation" as interpreted) via instruments such as cease and desist letters, restraining orders, gag orders, etc. (Although people don't always adhere to those instruments, there is still reprimand possible if reported to investigators.) 2) upon decision of court or school district, if SD had been found guilty of wrongdoing, the team would have still been subject to loss of coach, but the world would know it was for "x, y, z" wrongdoing.
As it stands now, the public defamation campaign, with no rules, no boundaries, no protections for anyone, no timelines for ending, such as a ruling or verdict, and the resulting scorched earth due to the nature of such campaigns, is what caused the sudden destruction of this running team. There is no way to protect the athletes, coaches, or conflicting parties in a no-rules public defamation campaign.