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.
Does this person never leave their room? Why run the fan when the room isn't occupied? That's just wasted electricity...