In my opinion, the imagery makes no difference. Those who hold others inferior, do so because of what their parents, and perhaps their peers (who got it from their own parents,) taught them early in life. Those who don't prejudge, who don't believe being different constitutes inferiority, will use imagery, be it art or porn, for what it is, entertainment, and don't alter their perceptions because of what they see.
These modern day philosophers who decry porn as abusive sexism miss the real point, that people are mostly ill-educated in the first place. Take away the porn and nothing would change...