Your friend needs to understand what Jesus was talking about when he said call no man “father, teacher, or master.” Please note that he had just finished dealing with the Pharisees who had improperly tried to test him(see Matt 22:41 thru 23:7).
During the time of Jesus, there were a number of sects within Judaism. The main sects were the Pharisees, Saducees, Essenes, and Zealots. These sects had houses of teaching within them, and each had a leader.
Within the Pharisees there were two famous rival houses. They were the House of Shammai(Beit Shammai) and the House of Hillel (founder of the Beit Hillel school). The individuals that these houses were named after were considered the “father” of the house.
Jesus warns the apostles not to be fathers to “separate” houses for there is but one house of the Lord. Jesus also says to call no man “teacher” or “master.”
The apostle, Paul, was taught by Gamaliel[Acts22:3], a pharisee from the house of Hillel. Gamaliel was, in fact, the grandson of Hillel. Gamaliel was known as an elder and had the title of “Rabban” which means “Our Master.” This title explains why Jesus also said call no one “master”, for there is but one house and one master of all.
Again, Jesus wanted unity [see John 17], and does not want the apostles to set up separate houses or schools of thought. The corollary of this is clearly expressed in Paul’s complaint in 1 Cor 1:10-15 where some are arguing their superiority by being baptized by, and belonging to, Paul vs. Apollos, or Cephas, etc. Paul goes on elsewhere to further warn against factions and divisions, and stresses the importance of one mind and unity of doctrine.
The meaning of “call no man father, teacher, or master” concerns unity and consistency of doctrine and has nothing to do with the commonly used references that are seen elsewhere in scripture or everyday use. Most importantly, it has nothing to do with Catholics calling a priest “father.” The apostle Paul calls himself, the “father” of Timothy and there are numerous examples in the NT where someone is referred to as “father” subsequent to Jesus statement in Matthew. It is all about context and what Jesus intended for the apostles. Hopefully, what has been provided will be helpful in that regards.