The Worst Audience Behavior is:

The worst audience behavior is shouting out. Shouting out can be put in different occasions. It can be used when you shout a the speaker without his/her permission. Also, it can be used when you talk to your neighbor beside you. I believe it is the worst audience behavior because it is disrespectful to the speaker and the audience. A shy presenter is putting a lot of effort in the presentation and it would help him/her if the audience is respectful. Also, talking to your neighbor will interrupt the learning opportunities of your surroundings. That is why the worst audience behavior is shouting out.