Most Helpful Guy
1. Beauty lies in eyes of the beholder - whoever coined that quote knew what he/she was saying :)
2. Likewise there could be many reasons why this guy stated this
2.1. Your perception may be that the girl is uglier than you while his might be otherwise
2.2. He may be attracted to you or simply wants to check how you react to his finding another girl attractive
2.3. It could well be a matter of chemistry between them even if one sided aka in this case his :)
2.4. etc :)
Most Helpful Girl
Because he finds her more attractive.
Beauty is in the eye of the beholder.