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Even a chapter before Jesus made greater claims, even equality with God, and not a single disciple leaves.
Jesus had also called himself a door and a vine, No disciples murmur How can this guy made of wood or does he think he is a plant.
But when it comes to precepts of what you are allowed to eat or not so deeply ingrained from childhood even Peter still had objections after even the ressurection:
Acts 10
13A voice came to him, “Get up, Peter, kill and eat!” 14But Peter said, “By no means, Lord, for I have never eaten anything unholy and unclean.” 15Again a voice came to him a second time, “What God has cleansed, no longer consider unholy.” 16This happened three times, and immediately the object was taken up into the sky.