i dont know if you have done more partying then her, but there is no way anyone can prove that. and also she was joking around you dont need to take it like a personal insult, if you have done as much as you claim then you would have known that. and been nice about it. trust me she knows/understands more then most people who are unmarried, what marrage is about. and what really counts in a relationship.
and if your posting at work why would you need to explain yourself about the posts to your wife?