He told Diane Sawyer, in a 2005 interview, that "my father never lied to me."
Since his father denies the Holocaust and holds the Jews in contempt, it is fair game to ask him if he holds the same views, or if he believes in the truth of them.
Yes, this has been asked of him again and again and again ad nauseum to trap him into some kind of statement. Typical behavior of Sawyer and the rest of the MSM.
Because of the intense pressure to defame his father, I can see why Gibson might have made a positive comment such as this about his father even though it might not be true.
I'm not going to necessarily hold Gibson to a 6 word statement among all the millions of words he delivered in the myriad of interviews he has done. I'm sure he has said a lot of stupid things...in fact, I know he has because I've seen him say and do stupid things on various occasions.