and threatened to have him arrested? you think that's fully legal? but they (air waitresses) have so much power, they likely COULD cook up something that would cause the guy to go to jail. its absurd that attendants have this much power, but lately in the last 10 or so years, they do. its bullshit but they do have power over you.
if I was the guy being abused like this, I'd ask them 'have you ever heard of the streisand effect. I'll wait, you go look it up and then come back and see if you want the PR fallout that you're gonna get. go google it. here, use my phone.'
no shit, I'd put them on the worry, or at least give them some insight as to the huge mistake THEY are about to make.
they could still cause me trouble, but I would NOT delete a post (I don't tweet or fb) on some company's request unless what I said was truly illegal or against some contract (like an employment contract). but being a CUSTOMER and being threatened with jail unless you remove your freedom-of-speech right, that's just beyond what I would put up with.
at least the story made the news, so the end effect of his post is now the same and the airline did NOT win this time out.