Do Redditors with Aspergers need things like /s and /jk to "get" online sarcasm?

Just had a run in with zoomers on discord. I made what I considered a joke that to me was obviously sarcasm, but the zoomers in the chat took it seriously then informed me I they couldnt have know it was a joke because it was "in text", and that I should have added /s.

So is this a zoomer thing or the fact that the discord was for a 400 level math class and half of them are on the spectrum?