Another reason is the aggresive treatment of Farrington towards his son. After being defeated by Weathers in the clasping hands episode, he feels terribly upset and powerless. The alcoholic could not stand the idea of being defeated by another man and even worse ending the day without being drunk. Later, he let his rage out at home, encountering his son and beating him because he did not know how to fire out. Needless to point out the words used to refer to him such as "Take that, you little whelp". What does he know about subtlety and tact? I guess nothing. His behavior leaves no more to say that he was born in a traditional-conservative family whose men's role was basically to go out work and women, in contrast, must stay at home caring of children and do domestic labour.
I could provide many other details of my apathy reaction towards Farrington's character. However, I also believe that it is completely logical why Joyce's intention was to show such a character, in order to present a popular lifestyle of the Irish culture in the nineteenth century.