Have you tried petting him under his chin instead of the top of his head?
I think he has been taught to not trust anyone towering over him and reaching down to him. Maybe the kid did this and the end result was being pulled, hit, or suffer discomfort in any way. Winston learned this is not a good thing, and learned that by snapping it will keep people away. It's sad really.
With time, he will learn to trust you and not fear those that reach out to him. Just be patient.
__________________ Littlest JakJak 
We miss you Kaji 
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