No one ever argued that one has to be a priest to be someone in this church.  However, to keep a person called to ordained priesthood, excluded from their vocation, because you hate their gender, color, ethnicity, etc. is sinful and extremely damaging to both the Church and the targets of that hatred. 

No one has a right to be ordained a priest but each person called by God has the right to be treated without discrimination based on their body or flesh.  Jesus Christ commands none of us, especially leaders and bishops of our church, treat any others, any differently, than the way they wished to be treated themselves & so they sin if they deny capable Sisters in Christ the same sacrament they were freely offered to take part in. 

Same sacraments being available to all baptized members of our church is indeed a right given by God.  If it were not, then we could keep priesthood from certain races and ethnicities too without sinning and Jesus has never led us to believe that is correct.