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 feel that everyone on the internet just gets me. The world would be such a better place if everyone were as kind and gentle as they are surfin' the tubes and sharing good vibes like they do on 4chan.
Also, OP likes to rape oxen. Just throwing that out there. I don't judge though.