I have a lot of friends into punk who are also into guys who are skinny types. Just exercise and turn what you do have into muscle.
Um, have you paid any attention at all to the hipster scene?
Skinny guys are kings in that particular subculture.
and that being lean/skinny for a man is a bad thing because only women are supposed to be slim.
Also he said in the dating world slim men are at the bottom of the barrell and are seen undesirable as fat women.