He overreacted,but some people are very afraid,even to the point of a phobia,of a dog.
And he could be just a jerk looking for a fight,best to call the dog and walk away.
If he had provoked you to the point of you guys fighting ,your dog would have bitten him to protect you,and the poor little kid would have to see all that drama.It could have gotten nasty.
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I am the dust that dances in the light. - Rumi