An eye for an eye. Hmm.
Is this what humanity has come to...Where is compassion, understanding. Stuff happens in life...pick your battles...but was this one???
This old man really did nothing to you, except some trash talk (probably because of dementia or some other condition of age), but you could sit blithely by while he could have been badly hurt. Yah! That is quite a better story to tell. Sorry, I just don't get it.
All the best,