Well, first of all, it's old people slang at this point.
And second, I don't understand your outburst. You're free to start a serious thread about criticizing Russia's rhetoric, right next to the sarcastic thread that is criticizing Russia's rhetoric.
"/s" isn't 4chan slang, it's generic forum slang that existed before 4chan. It's a shortened version of XML-style closing tag.
Maybe they wash: 🤞
It obviously means that the fart was spicy and is now burning his anus.
Umm... Is the joke that what we see is actually a very small part of EM spectrum and things that we're unable to see is the vast majority? Or just that "haha rainbow gay"?
I'm pretty sure most regular users will not even notice the charge, and find it useful down the line. Cause one day they will mess something up, complain to MS that they "lost their work", will be pointed to the cloud where everything was synced, and rejoice. Most users don't really care about the implications that their documents are in the cloud.
It seems that everybody who doesn't know Cyrillic thinks that Д is the Cyrillic A...
Cube*.
Triangular prism*.
I also thought about Chao Garden but from Sonic Adventure 1
But what is even the point of arguing with them? Assuming they are a stranger, of course, and not a person you have a personal relationship with, too. You just make a mental note that the person is ok with something you consider immoral and move on.
Future people are very insecure about their height.
The one who's hard to understand is you, with your complete lack of punctuation. "/s" is extremely common and pretty much everybody understands what it means. If you didn't know until now, no biggie, now you do and all is well.
And to answer your question, if a comment or a paragraph ends with an "/s", then you can be sure the author was being sarcastic in that comment/paragraph.
If there's no indicator, it could still be sarcastic or it could be serious, use your own judgement.
So no, not everything should be taken as sarcasm.