The problem is that your joke is exactly what a proportion of the population would write in all seriousness. And when called on it, they’d respond with “it’s just a joke! Don’t be so uptight!”

But if NOT called on it (because everyone thinks it’s just a joke), they’ll run with it in all seriousness.

So better just to downvote, signalling to people that the PoV isn’t considered OK.

If the /s makes it no longer funny, then it’s probably a good idea to think about whose expense you’re finding it funny at.