Assuming the facts are as given the complainant may find they just dug themselves into a much deeper hole than they can imagine....
I'm intrigued by "the facts". As I understand it, there was in fact no swearing. Just one big mouth (who pretends to be an OH&S Facilitator) interupting a presentation to dignitaries by mouthing off at "wife" of an employee and then to the employee. No swearing, just making a scene about her not being on his list of inductees. This was just an extension of previous harassment of "wife" by this jerk and his mates. The dignitaries were incredulous/ embarrassed/ angry that anyone would have the gaul to make such a scene. The wife was not the first to complain. The dignitaries got in first.
Please be assured QF can not touch you for acting in your role as OH&S The Act states;
The Act doesn't cover this situation where the self proclaimed controller of all BMS OH&S was trying to show off in front of a captive audience by harassing someone sitting quietly listening to a presentaion..