As a former community theater child actor, I have seen my fair share of crazy stage parents. The craziest ones weren't screaming from the audience saying, "Sing out Louise," but were constantly putting ideas in their child's head about how they had to be the best puppy in the production of 101 Dalmations KIDS or else! I definitely think giving notes to your 8-year-old about how they could improve their performance is much more damaging than being an overly enthusiastic audience member.
The mom in this story is both a bad audience member and a harsh critic. When her 5-year-old son was onstage during his Kindergarten play, he was sucking on the strings of the giraffe hat he was wearing. If he were ten and doing that, it would be cause for concern, but at this age, parents can only laugh at harmless mistakes like that, or so I thought. This mom decided to bark at him from the audience to tell him to stop sucking on the string, much to the dismay of her husband.
This image is for illustration only, and the subjects are models; the image does not depict the actual subjects of the story.