"Why do people often say that the Bible is a book that full of ..."
racism: Because it is. It's full of anti-Gentile prejudice, even in the New Testament book of Acts. Anciently the Israelites were the most racist people ever.
sexism: Maybe the apostles were a little sexist, but certainly not as much as feminists seem to like to pretend. St. Paul didn't want women leading congregations or interrupting services with questions. And understanding the difference between men and women isn't sexist. It's realistic. We have different experiences from the uterus which must have their effect on our development and outlook. Spirits also have gender. It isn't an elective. It's an eternal part of who we are.
homophobia: Wishful thinking. Recognizing homosexuality as the paraphilia it is is not "homophobia."
"genocides": Well, the Lord did intend to cleanse Canaan completely of the abominations of human sacrifice and sexual fertility rites. Israel didn't cooperate completely, which led to their rebellion against the Lord and their eventual undoing. But it is never man's place to decide upon such a course of action. Only God can command such a thing, because he will command it only when it is the best possible course of action for the greatest possible number of his children eternally. He has to look at the long view.
"violence": It IS full of violence, much of which the Lord never wanted.
intimidat[iom]: Because the Lord in the Old Testament was dealing with a rabble of murderous, adulterous slaves. Most of them either couldn't or wouldn't respond to any higher motivation than fear.
authoritarianism: Probably wishful thinking. God doesn't lie; he says what needs to be said. He's always right. It's better for us to cooperate with him instead of rebelling.