1 Corinthians 11:14
It is writtenoth not even nature itself teach you, that, if a man have long hair, it is a shame unto him?
If a man have long hair: It cannot be said that he has in mind a specififc kind of haircut. He is simply saying that it is shameful for a man to wear his hair in an effeminate way. If you believe that having plain long hair can cause your brother or better yet your sister to SIN!? than it raises issues.