Yep, he is best avoided imo. I think it is easier to 'win' a discussion when you address the points you would like to have been made rather than the ones actually made.
This is an interesting point because before you can worry about your OWN before others you have to define who your own are. This definition could be anything from members or your immediate family, extended family, people in your street, suburb, town, etc etc.
How exactly do you define your OWN?