edit: I haven't spoken to my father in over 20 years, and I probably never will again. What finally turned me to this point was having children of my own. I saw what he really was then, and I was determined that he would never have a part in their lives. They're adults now and are free to contact him if they won't, but they know what I've told them about him, and they choose to keep the separation.
This particular comment, though? Nah, suggesting "beat some sense into him" was out of line by community standards and common decency. And as someone who grew up bruised, it was a little triggery for me too.
Just goes to show interpreting comments on the 'net without any context is easier said than done. I always try to keep positive assumptions in mind before I hit reply.