What are you talking about? Even usenet in the 80s recommended using emoticons to mark sarcasm/joking remarks.
Avoid sarcasm and facetious remarks.
Without the voice inflection and body language of personal
communication these are easily misinterpreted. A sideways
smile, :-), has become widely accepted on the net as an
indication that "I'm only kidding". If you submit a satiric
item without this symbol, no matter how obvious the satire is to
you, do not be surprised if people take it seriously.