There are countless topics here on the sermon mount having the same doubts due lack of understanding of the hyperbolic, figurative language used by Jesus or all the writers of the NT. None of those words are meant to be taken in an absolute sense: hate your family (Luke 14:26), gouge your eyes, do not resist evil, turn the other cheek, about anger, lust, divorce etc. The teaching is aimed about being excellent and perfect (Matt 5:48). To understand the context, you first need to understand who exactly is our brother or neighbor? It does not mean the blood relative or your countrymen, but a compadre, a friend, companion or a close associate, a well-wisher who loves and supports you as his own.
[ESV Mark 3:31-35] And his mother and his brothers came, and standing outside they sent to him and called him. And a crowd was sitting around him, and they said to him, “Your mother and your brothers are outside, seeking you.” And he answered them, “Who are my mother and my brothers?” And looking about at those who sat around him, he said, “Here are my mother and my brothers! For whoever does the will of God, he is my brother and sister and mother.”
[ESV Luke 10:25-37] And behold, a lawyer stood up to put him to the test, saying, “Teacher, what shall I do to inherit eternal life?” He said to him, “What is written in the Law? How do you read it?” And he answered, “You shall love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind, and your neighbor as yourself.” And he said to him, “You have answered correctly; do this, and you will live.” But he, desiring to justify himself, said to Jesus, “And who is my neighbor?” Jesus replied, “A man was going down from Jerusalem to Jericho, and he fell among robbers, who stripped him and beat him and departed, leaving him half dead. Now by chance a priest was going down that road, and when he saw him he passed by on the other side. So likewise a Levite, when he came to the place and saw him, passed by on the other side. But a Samaritan, as he journeyed, came to where he was, and when he saw him, he had compassion. He went to him and bound up his wounds, pouring on oil and wine. Then he set him on his own animal and brought him to an inn and took care of him. And the next day he took out two denarii and gave them to the innkeeper, saying, ‘Take care of him, and whatever more you spend, I will repay you when I come back.’ Which of these three, do you think, proved to be a neighbor to the man who fell among the robbers?” He said, “The one who showed him mercy.” And Jesus said to him, “You go, and do likewise.”
You can see that all those whom Jesus abused, were his enemies who eventually killed him, he did not violate his own command of hating your brother, but he came to die for them. There is nothing wrong with condemning and abusing. Jesus may have been the most abusive person in the Bible, and his disciples followed the similar language of condemning the wicked for their sins. I found some references of his abuses: Jesus called the Scribes and Pharisees "fools, hypocrites, blind guides, whited sepulchers, murderers, a generation of snakes,". He referred to the recalcitrant religious leaders as, "an EVIL and ADULTEROUS generation," "SERPENTS and SNAKES," and "children of the DEVIL." Why He even told the Scribes and Pharisees regarding the royal and mighty King Herod: "Go ye, and tell that FOX [that JACKAL]..."
Proverbs 1:20-26 Wisdom cries aloud in the street, in the markets she raises her voice; at the head of the noisy streets she cries out; at the entrance of the city gates she speaks: “How long, O simple ones, will you love being simple? How long will scoffers delight in their scoffing and fools hate knowledge? If you turn at my reproof, behold, I will pour out my spirit to you; I will make my words known to you. Because I have called and you refused to listen, have stretched out my hand and no one has heeded, because you have ignored all my counsel and would have none of my reproof, I also will laugh at your calamity; I will mock when terror strikes you,
See 1 Kings 18:20-29; Philippians 3:2-3; Titus 1:10-13 ; 2Peter 2:12, 19-22. In these examples, the apostles were imitating the language of Jesus:
“Do not give dogs what is holy, and do not throw your pearls before pigs, lest they trample them underfoot and turn to attack you. Matthew 7:6
Cf. Romans 12:17-21, Colossians 4:6, Ecclesiastes 3:1-8
You have noticed that the Christians with degrees from universities and seminaries, are no more knowledgeable on theology than the ignorant, corrupt religious leaders shown in the New Testament. They teach them to hate reason, truth and God, and create a blind-faith of irrationality. You should continue your open-minded research for the truth, leaving aside the propaganda of indoctrinated people, and seek God, you shall find him. Focus on the literary genre and the inherent figurative nature of the Jewish scripture. These are the last words in the NT:
[ESV Rev 22:12-15] “Behold, I am coming soon, bringing my recompense with me, to repay each one for what he has done. I am the Alpha and the Omega, the first and the last, the beginning and the end.” Blessed are those who wash their robes, so that they may have the right to the tree of life and that they may enter the city by the gates. Outside are the dogs and sorcerers and the sexually immoral and murderers and idolaters, and everyone who loves and practices falsehood.