Things like this have a real business impact. I've cancelled interviewing at companies based on conversations with former employees that the company didn't have a satisfactory answer for.
If I saw this in a public forum and Reddit failed to point out that the former employee was fired (and was aware he was fired) in a public setting (which would make them liable for being sued, if Reddit lied) holds alot more weight than "Oh, ya, that guy. He was full of shit" told to me privately would.