Absolutley NOT. Would never draw my weapon unless my life or someone elses life was in danger, with some sort of weapon, or some larger group. Life, Limb or eye sight, think of it that way.
If things continued the way they are on the film, and say that was you for what ever reason, I would have just made my way to my car as best as possible, got in, locked doors, and called the Police, if they continued to harass you, beat your vehicle, I would pull away and continue to sit in the area, then call 911.
Secondly, its sad to see something like this happen, especially in a childrens area, a place for kids to have fun, instead some petty differences ruined probably several kids birthdays.
Only two defining forces have ever offered to die for you, Jesus Christ and the American Soldier....One died for your soul; the other for your freedom.