

Just fyi, the slash in /s or /sarcasm isn’t some weird bracket, it’s meant as an XML style closing tag, meaning “end of sarcasm”. In full it would look as follows:
<sarcasm>Things are going great!</sarcasm>
But people drop the opening tag and the <> for convenience.
I’m aware of slash commands. If it’s a /sarcasm command, why would it be at the end of the statement?
What’s your source for this? I’m pretty sure “/s” means “end of sarcasm”, borrowed from XML/HTML.