Now, the controversy revolves around two elements of this liturgy: 1) who washes? and 2) who gets washed? Some say: everyone washes; everyone gets washed! Others follow the rubric requiring the priest to do the washing, but they usually try to mix and match the washee's to accommodate some weird need to use this liturgy to express the "diversity" of the parish (as if just looking around in the pews doesn't demonstrate this well enough).
The B.I.G. issue, of course, is whether or not women can be included as washee's. The rubrics clearly require that the washee's be men, males (vir). In the U.S., bishops are allowed to grant pastors an exception to include women. Most do, I would bet. Fine.
What this debate about rubrics usually misses is the whole point of the rite itself. Jesus washes the feet of his disciples in order to show them that he is not only their Master and friend but their servant as well. He will go to the cross as a servant for them (and for us all). The priest, acting in the person of Christ, washes the feet of twelve men in order to liturgically enact this revelatory moment.
This liturgy is not about diversity or tolerance or discipleship or community-building. This is the moment when Christ--fully God, fully man--begins to empty himself in preparation for his passion and for the cross. In one very important way, this liturgy is about who the priest is for his parish--since he is and acts in the person of Christ as head of the Church, the priest is symbolizing his servant-leadership of the community. To use foot-washing on Holy Thursday for any other purpose is simply perverse.
Some will argue that since Jesus tells his disciples "to go and do likewise" that this is reason enough to turn the liturgy in a podiatrical free-for-all. If this is the case, then let's follow the example of scripture precisely. Celebrate the liturgy as it is written and then "do likewise." In other words, the priest will wash the feet of twelve men and then another part of the liturgy can be devoted to the "doing likewise." Or maybe a foot-washing free-for-all liturgy can be planned for another time of the year, or even regularly scheduled during Lent. Not perfect solutions by any stretch, I know.
What is tiresome about this yearly debate is the constant refrain of prog liturgists that this event needs to "express diversity." No, it doesn't. There is no good reason for this liturgy to do any such thing. Why this liturgy should yield to the demands of liturgical political correctness is beyond me. There's no demand that baptisms reflect the parish's diversity. Diversity in confessions? Will every Latino couple getting married in the parish need to find an Asian couple to get married with in order to celebrate diversity? Can three black guys get ordained to the priesthood at the same time, or do they need to wait until at least one white guy is ready for ordination?
Of course, the other possibility is to simply skip it. It's optional.