I used to be a big proponent of “/s”. My rationale was that reddit was a worldwide site, and it wasn’t fair to exclude people who weren’t fluent in English. Plus, I didn’t want to live up to the stereotype of the selfish, arrogant American.

Now, I just don’t worry about it. Over time, I realized I could say something obvious and seemingly non-controversial, like “the sky is blue”, and people will disagree anyway. If somebody a thousand miles away takes a sarcastic statement literally, and decides that I’m an asshole, then so be it.