Though I suppose if you take your position to its logical extreme, everyone who is Jewish should question their Judaism, since its dependent on who your ancestors (specifically your female ancestors) were.
I'd be very happy if people made such choices on their own and questioned traditions in a logical and considerate way.
Joesons say that if your father was named Joe you belong to this group by default and whatever rules the group has written down apply to you and you should follow them. You'll be judged by them as a bad person if you don't. If you question your belonging to Joesons it will be interpreted as anti-joesonic.
Does it bother you that's you're labeled anti-joesonic in that case? Why would the situation be different for anti-semitic? Because of current number of Jews? Their history? Other reasons?
This guy did a full about face from "Gypsies and Jews are destroying Hungary" to "Jews should be welcome everywhere, but we need to stop Muslim immigrants from destroying our tolerant open society".
Family infighting sure does suck, doesn't it?