In reading verses 3 and 4 of Isaiah 66, it is clear that God does not delight in the mis treatment of animals, and that there are plenty of humans who do ("have chosen their own ways"). In this way it does show that God is more in line with the "vegetarian" frame of mind than every day sinners.
Also, let us not lose sight of the big picture here. In the original glory of the garden of edin, there was only vegetarianism. This was followed by the glory of God forfeited through sin, which was followed at the cross by the hope for a restored glory of God, which as clearly described in the Bible will ultimately restore the world to only vegetarianism.
"It is interesting to see who God selected to have join Him with His Son at the transfiguration of Christ (Matthew 17:1-3). Moses and Elijah were honored to join with the Father and the Son in that glorious event. Moses represented all those who will die and then be resurrected to everlasting life (Jude 9). Elijah represented all those who will be translated at the Second Coming without seeing death. Both Moses and Elijah ate a vegetarian diet in their later years. For both, a vegetarian diet was God’s prescribed diet while here on earth."
See "God’s End Time Vegetarian Diet: Bible Truth or Human Invention?"
It is also worth noting the following from a Bible commentary: Isaiah 66:3. Killeth an ox. The Hebrew of this passage is very brief, and several interpretations are possible. There is no connective between the phrases; for example, the first unit reads, “the slaughterer of the ox the slayer of a man.” The connective supplied by the KJV, “as if,” and that supplied by the RSV, “like,” are based on the reading of the LXX and the Targums. Translated in this way the meaning would be that without the corresponding spiritual experience the offerer of an ox would be no more pleasing in the sight of God than a murderer. The other combination of phrases would express similar comparisons.
It is possible, however, to supply the connective “is” thus, “He that slaughtereth an ox is a murderer,” etc. This gives the meaning that those who came to worship God with oxen, lambs, oblations (cereal offerings), incense, were at the same time committing murder and engaging in idolatrous rites (see ch. 65:3–7).
Their own ways. The thought in this verse is related to that in the following verse. As these people have chosen their own wicked ways, God will “choose” punishments for them suitable to their iniquities.
Regarding Proverbs 23:20, applying "logic" to this verse seems to open the door to the possibility that it would seem preferable to dine with vegetarians than with glutenous omnivores.
Regarding your comment on "before the Fall", clearly back then people were living a more noble lifestyle. So I see no need to apologize for encouraging Christians in this way to consider vegetarianism as a higher standard. In fact in the link I provided above, you will likely find that God is calling on Christians to do so.
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