This is why as a business you should ABUB, Always Be Union Busting. Once you let your workers unionize you're screwed, they'll start making all sorts of ridiculous demands and if you don't cave their every whim they could strike and lose you millions.
I like to send in a plant who talks about union stuff, sniff any real employees that react positively to it and shitcan 'em before they can cause any trouble.
Sarcasm can't be conveyed well through text on the internet, especially when someone could say similar messed up shit unironically. Even if it was explicitly stated, fucked up jokes are disgusting. That doesn't necessarily mean they're bad or can't be funny, just that they're nasty jokes.