I mean, wild animals generally don't like being disturbed. At best it stresses them. While the domain immediately screams bias, they cite sources: https://www.animal-ethics.org/wild-animal-suffering-section/...
The relevant bit there would be the 'frightening sounds'. A shouting/screaming child running at a bird isn't something that is normal for the bird.
Further reading:
- https://www.citylab.com/environment/2016/06/birds-city-healt...
- https://qz.com/726926/like-people-birds-that-live-in-the-cit...
- https://www.theguardian.com/environment/2008/jun/29/wildlife...
- https://www.mpg.de/533349/pressRelease20060901
- https://www.sciencedaily.com/releases/2016/06/160620112028.h...