Yes, this is most definitely overstepping their boundaries and shows they are not just a benign religion.
Somebody else might have beat the shit out of this man for raising his hands to somebody else's child! This is where Jehovah's Witnesses have to be stopped: when they overstep their boundaries to this degree. Oh, they overstep in every way, but when it comes to somebody's child they have pushed it too far.
I know you want to "thank" this guy for letting your son see the light and free himself, but this person deserves to be put in his place for this emotional abuse. Witnesses think they can say anything they want and you are just supposed to "take it" especially if you are young. They think people are supposed to be whipping boys or sounding boards. Just what do they see themselves as??
.. There's a few people in the Jehovah's Witness religion I would love to tell off GOOD for similar reasons when I was younger but I'm afraid these arrogant individuals have passed away. Anybody who would dare open their mouth to me like that now would get more than they bargained for.