usccb.org/prayer-and-worship/liturgical-resources/triduum/holy-thursday-mandatum.cfm
4.Because the gospel of the mandatum read on Holy Thursday also depicts Jesus as the “Teacher and Lord” who humbly serves his disciples by performing this extraordinary gesture which goes beyond the laws of hospitality,2 the element of humble service has accentuated the celebration of the foot washing rite in the United States over the last decade or more. In this regard, it has become customary in many places to invite both men and women to be participants in this rite in recognition of the service that should be given by all the faithful to the Church and to the world. Thus, in the United States, a variation in the rite developed in which not only charity is signified but also humble service.
5.While this variation may differ from the rubric of the Sacramentary which mentions only men (“viri selecti”), it may nevertheless be said that the intention to emphasize service along with charity in the celebration of the rite is an understandable way of accentuating the evangelical command of the Lord, “who came to serve and not to be served,” that all members of the Church must serve one another in love.
6.The liturgy is always an act of ecclesial unity and Christian charity, of which the Holy Thursday foot washing rite is an eminent sign. All should obey the Lord’s new commandment to love one another with an abundance of love, especially at this most sacred time of the liturgical year when the Lord’s passion, death, and resurrection are remembered and celebrated in the powerful rites of the Triduum
So now you can see where it might be confusing…and therefore one might follow one’s own Bishop…and not be disobedient. After all, he promised obedience to the Bishop…no?