I threw the birds some pop rocks that were sitting in front of me.
Why were you throwing the pop rocks at the birds?
I was just trying to scare the birds away.
Intentionally trying to scare or hurt animals is very wrong. If you want the birds away from you all you have to do is walk towards them and the flyaway. If you continue to try to hurt animals people may find out about it and look down upon you.
Well what if the birds attack me or shit on me or something, this is a park right?
The birds have just as much right to be there as anyone else, so purposely trying to get them to fly away is kind of immoral to do. In addition to that, you could hurt the birds by doing this.