Communication is always a key. If she's against poker, there must be a good reason underneath it. Maybe your friend is ditching certain tasks, not keeping promises, not paying enough attention or avoiding something when he's playing poker. And instead of facing the real reason and talk it through, just accuses his wife for hating on his hobby. I doubt that anyone will seriously would be against their significant other's hobby, to be honest. So in my opinion, either your friend is in denial and don't want to face and discuss the real issue or their relationship has more serious problems than poker.