This is a great way to distinguish yourself from the unwashed masses at gaming events.
Caveat: There is a layer of irony that comes at the expense of a diminished message and it is this:

SOAP is an acronym for a web service communication protocol (ie, web developers use it). Therefore, stinky programmer geek x seeing the shirt will attempt to outdork by expounding on the frequency with which he uses SOAP, while it remains clear that he rarely uses soap.