As much as we can try as individuals to not be biased, racist, ageist, sexist or discriminate based on religious beliefs, or anything else, it is just in our nature and instinct to a certain degree. Men will instinctually want to surround themselves with beautiful women, and men who are less of a threat. We gravitate towards people who look like us because we most likely have more things in common and therefore will have sense of 'belonging'. They have even done studies on babies- tiny little infants, and even the babies had a more positive reaction to the more 'attractive' people- based on facial structure, etc.