The young man you see in line watching the Roswell, New Mexico Subway employee prepare his sandwich has an unusual haircut. The cut is an uncolored peacock style. The older generation has always poked fun at the younger generation attire and choice of music. Organisms seeking a mate are trying to get noticed anyway they can usually for the purpose of procreating.
Sexual selection competes with natural selection with respect to a “species progress” with the trade off being that a creature that is too sexy may have compromised survival ability. A deer with unusually large antlers may have decreased mobility or an acutely colored peacock an easy catch for a predator.
Fortunately for this young man, the human animal does not have to worry too much about being eaten by predators other than the flesh eating microbe variety. Maybe he will get snapped up by a girl with rich parents and never have to face an employment market that could frown on such ostentatious displays.
If you get time read the work of Nick Collins which states that the human brain is the equivalent of a peacock’s tail with respect to attracting mates and causing rock hard erections.