Just because you made it work with your method
doesn't mean it is the right one
there are tonnes of people that able to train their dog without ever laying a finger on their pet
their claims is just as strong as your claims

if you see the ori post
something like "Very naughty lor... I know i have been neglecting him/her, but have to hit to teach" or something like that

She, herself hav proclaimed that she have ignored/neglected the pet dog
and when act up, use force to "teach" it

Please understand that after so long time the dog domesticated, the pet have lost the ability to go wild
their action mirrors that of the owner
Use the soft method cannot, means you are not able to handle this dog anymore
give it up, get another one, or simply don't get a pet if you cant fulfilled the needs
you are the one choosing them, they have no choice

and if this story is not true, then she have got what she seek out by posting the stupid post
attention, bad attention, but nonetheless still attention (or /k called it whore-ing)

and dun be naive to think all those posting here is actually 100% rage at the action she did
It is just simply contradict most people own perception of right and wrong, and voice it out.

at least the people that voiced their disapproval have a normal functioning brain to decide right and wrong

TLDR :
Hit dog wrong - ppl will complain, live with it
Hit dog and post on 1 dimensional facebook/online - expect more flak from unknown person - even more wrong, live with it
create fake story for attention whoring - same or worst wrong, ppl complain, live with it

as for me, I called them as I see them, nothing more nothing less