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.
I appreciate what you’re saying, but trust me, it was me. A classic case of “If you walk around town all day and all you smell is shit, check the bottom of your shoe.” When people came back to talk to me at my job I thought I was joking, when really my form of joking was a very dry sarcasm that could easily be taken offensively. I just never knew it.
I learned to introduce it slowly over time, see how people react to it. If they pick up on it then I’m cleared to keep going, but to never assume that someone will pick up on it by default.