Oda Mae Brown
Team Owner
I didn't get that at all though it seems to be a recurring theme with lesbians and straight male best friends in TV land and the movies. Anyways,to mean,he was indirectly saying if his partner was that important to him, that would have given him enough courage to come out his parents. Presumably, his platonic relationship with MJ was more important to him than his romantic relationship with his boyfriend.
I don't think he thought his friendship with Mary Jane is more important that his relationship with his boyfriend. He just put the fear he had of coming out to his parents and in general above his relationship with his boyfriend.