While some may say what he did was illegal or disruptive, this is not necessarily true.
JWs invest considerable time inviting the entire community to attend this 'special annual celebration'. If someone isn't home when JWs call, a printed invitation is left in each door. There are no stated requirements on who may attend nor is there a stated restriction on who may not attend.
Although JWs may not consider it this way, in passing the emblems, that is an invitation for each person attending to take their turn to personally participate in the celebration.
The person waited for his turn and when he was passed the wine, he used that opportunity to calmly offer a toast before drinking the wine he was offered.
Although anyone is invited, JWs take exception when everyone attending does not adhere to appearance and behaviour dictated by WT. When someone doesn't follow the script, JW elders will attempt to physically remove that person or will proceed to call the authorities, even without first contacting WT legal department.