Unless you're a figurehead at some company any company that would fire you because of something like that most likely isn't worth working for to begin with. Of course that doesn't offer anything in terms of support or recourse if it should happen, but those employers open themselves up to a particularly nasty form of denial-of-service attack and they should probably be made hip to that.
Otherwise one day some group will have fun with them until they have no employees left.
Ok, but in the meantime you’re still unemployed, stressed about health insurance and debts and feeding your family, and you get to explain to every potential employer why you were fired.
I think that case is rather different. They liked the tweet with Marriott's account, not their personal after hours account. Ridiculous or not, if your job is running Marriot's Twitter, part of the job is liking the right tweets.
When you run a company's social media account, liking and not liking the right things is part of the job description, and probably out of bounds for wrongful termination.
Otherwise one day some group will have fun with them until they have no employees left.