Punctuating sarcasm?
I’m not at all sold on the need for a sarcasm punctuation mark and for a few very good reasons.
First, not all sarcasm is created equal - for example there is the generic sarcasm and then there is my preferred 
. Would there be a variety of punctuations to identify the type of sarcasm?
Second, a sarcasm punctuation mark takes away so much from its purpose if you have to put big signs around it that says this is sarcasm!.
Third, what would then happen to sarchasm? After all, what fun is sarcasm if everybody gets it?
As the saying goes, if you have to explain it - they wouldn’t understand anyway. And sometimes its just better left that way…