Always two ways of looking at something.
"My way & the wrong way"
No actually, if that rod had strong emotional value to the man. Like it was his recently deceased fathers rod or something then I am not surprised if he was pissed because it had been significantly altered without his permission.
There may have been a scratch, gouge or whatever that reminded him of a particular trip he enjoyed with a loved one.
Many of us cherish anything that reminds us of such moments, rather than the circumstances and trauma often associated with our loss.
Ask anyone who has lost someone through cancer what they choose to remember.
It's rarely the recent times.
I have no doubt your father was absolutely being altruistic in his intentions.
"Going the extra mile" is a trait that is admired and rightly so.
It's a double edged sword on rare occasions though.