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...those who had listened to sexist jokes were much more tolerant with male battering than those who had not.

The results ring true. I have found domestic violence, even street violence is justified in the mind of the offender by disrespect. People in general tend to diminish in importance even dehumanize a party they wish to assault. This has been true in war of all kinds throughout history. Abusive men justify their behavior by diminishing the value of women.