Instead of arguing, you should emulate My example and learn from Me.
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John the Evangelist notes that the washing took place during the meal, suggesting that Jesus arose from the meal to perform this action (John 13:2, 4). But what transpired at the outset, before Jesus rose from the table to cleanse His feet? To find the answer, we turn to the Gospel of Luke, which recounts a disagreement among the Apostles regarding which of them deserved to be revered as the greatest. This contention likely did not stem from their seating arrangements at the table, as they had dined with Jesus before and were accustomed to their placements. It is also improbable that they quarreled over their rank in the Kingdom of the Messiah, for Jesus had previously resolved such issues. Most likely, the discord arose over the question of who among them should assume the servant's role that evening, specifically the task of washing the guests' dusty feet. This is supported by Luke's subsequent words, in which Jesus asked them, "Who is greater, the one who reclines at the table or the one who serves? But I am among you as one who serves." The statement, "And I am among you as one who serves," was undoubtedly made after Jesus had washed the apostles' feet, showing that the washing occurred only after their disagreement. Regardless of the cause of the dispute, it is clear that the Apostles were engaged in arguments at the very start of the evening. Such disagreements could not have arisen post-washing, as they would have been silenced by the humility displayed by Jesus. Furthermore, the dispute could not have occurred after the establishment of the Eucharist, which served to unify all the Apostles.
If the beginning of the meal was marked by the Apostles' conflict, which was followed by the foot-washing, which in turn preceded the teaching on humility, and ultimately led to the condemnation of the traitor and his exit, it is evident that the institution of the Sacrament could not have occurred at the onset of the meal, prior to the foot-washing. This follows from the understanding that, under the guise of bread and wine, Christ could offer His Body and Blood along with the command, "This do in remembrance of Me," only to those who believed in Him—those who would cultivate the Kingdom of God, a realm of love and righteousness, and connect all who enter it through the administration of this sacrament of unity with its Founder and eternal Head. Judas, however, was not part of this Kingdom, having planned to betray his Master, and thus was not entitled to witness the establishment of this sacrament. The sequence of events at the Last Supper is as follows: the Apostles' disagreement, the washing of feet, Jesus' teaching regarding their dispute and the example of humility displayed, the denunciation of Judas, his departure from the Supper, the institution of the sacrament, and the farewell dialogue. From this, it is clear: Judas was absent during the institution of the sacrament.