I appreciate that she didn't sugar-coat her own behavior here; drunkenly slapping a coworker at a company event (or even in one's free time) is enough to get you fired at most businesses.

Still, the major theme here seems to be a complete lack of professionalism from all involved (seriously, who tries to set up two new coworkers?) To me that screams "culture problems" coming from the top, not handful of bad apples. When your department is run like a Greek house, don't be surprised when the employees act like frat boys and sorority girls.