I upvoted both the "don't use /s" suggestion and your comment. IMO both are important points.

Personally I use /s only when the statement is s likely to be otherwise misunderstood. That goes for Reddit as well.

/s was never meant to be ubiquitous on Reddit. What happened is that new users saw it, didn't know what it means, asked, and when they were told it expresses sarcasm, they thought it's mandatory.

Do you also find it difficult to get jokes? Because we could explain them to you if you want.