Final answer:
The reporter's bias in the given scenario can be classified as bias by selection of sources, as he presents only the negative aspect of the play, potentially swaying the audience's perception.
Step-by-step explanation:
The scenario described suggests a form of media bias by a selection of sources. When the reporter, who personally did not like the play, only highlights the negative aspect of one audience member walking out, there's a potential bias in the reporting. This can be an indication that the reporter might be selecting sources or facts that align with his own negative view of the play, instead of offering a balanced overview. If the reporter cited multiple sources, both those who liked and disliked the play, then it would represent a balanced viewpoint. But focusing solely on the negative aspect provides an imbalanced view that sways the audience's perception. This type of bias could affect readers by providing a slanted view of the play's reception and quality.