"If it's only in one hand, that means he plays guitar. I heard he likes to play Spanish guitar in his spare time"
ahh so thats why. oookay. Still long finger nails on men - (((shudder))) yuck
See for example: The Total Classical Guitar Method (tm) Care and Shaping of the [Guitarist's] Finger Nails
when the hell does he have time to play the guitar?
he has long fingernails BECAUSE he wants them that way
maybe a new look into other hobbies