The following might answer why these views and actions are anti-Christ:
Leviticus 19:18: You shall not take vengeance or bear a grudge against the sons of your own people, but you shall love your neighbor as yourself: I am the Lord.
Matthew 7:12: So whatever you wish that others would do to you, do also to them, for this is the Law and the Prophets.
Matthew 7:1-5: Judge not, that you be not judged. For with the judgment you pronounce you will be judged, and with the measure you use it will be measured to you. Why do you see the speck that is in your brother's eye, but do not notice the log that is in your own eye? Or how can you say to your brother, ‘Let me take the speck out of your eye,’