Agreed, Agreed and they still shouldnt have done it. Sometimes I say shit I know I shouldnt to customers because they are being assholes. They complain, the boss tells me off, I say "Fair enough" and I dont do it again for a while. But I know when I say the thing I shouldnt that "I'm gonna get a talking to for this" fortunately I'm government employed and I'm union so I know that a little backtalk isnt going to result in outright dismissal.
Ultimately the company could have turned around and sacked them all because I'm sure the company has a social media policy that basically says "if you do anything we dont like, we can fire you" and they would have had to fight it. They took a risk and I'm glad they didnt get fired (yet) but with all the layoffs in this space at the moment I wouldnt have.
If you say one thing to a single customer, there's that. But when you make that snarky post on a public forum it has a chance of getting amplified and misunderstood.