Just commit, no matter the response. Adding /s is akin to explaining a joke after you tell it. If someone doesn’t understand or pick up on the sarcasm, it’s not your responsibility to spell it out for them. You add /s because you don’t want to be held accountable.
Assuming everyone is a native English speaker is asinine. Disguising hostility as humor and expecting everyone to understand within a global audience scope is nonsense.
This is akin to respecting pronouns, explaining memes and images in alt text, and speaking up against bigotry. It is simply being a respecting human being with self awareness. You got to be the best semi-sentient entity you can be. /s
I set the language of this post to English.