Get real, dude. That assumes that people will say anything stupid when drunk and that they are as apt to tell a cop that they just killed someone or are a terrorist as they are to spout that they hate Jews and that Jews are responsible for war, etc.
Assuming Mel said what he said, drunk or sober, he's a Jew-hater.
He may be or may not. I do not know because I am not a mind reader and I have not seen a video or heard audio of the stop myself. Have you?