All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Fraternity is a must among all Muslims; Jinn and human beings alike, for they are all meant in the verses where Allaah The Almighty Says (what means):
The Prophet, sallallaahu ‘alayhi wa sallam, mentioned that all Muslims are brothers in Islam. [Al-Bukhari and Muslim]
There is no problem with a man fraternizing with a Jinn, provided that it does not lead to committing something prohibited or supporting it.
Allaah Knows best.