The façade of the Papal Archbasilica of the Most Holy Savior and Saints John the Baptist and the Evangelist in the Lateran, the Mother and Head of All the Churches in the City and the World — the cathedral church of the Diocese of Rome and the official patriarchal seat of the Bishop of Rome, who is the Pope.
The term “Roman Catholic Church” is not the official name of the Church founded by Christ upon Peter the Apostle. Why? Because she is commonly called the Holy Catholic Church and formally called the One Holy Catholic and Apostolic Church. No doctrine, dogma, official Church documents have ever officially named the Church as the Roman Catholic Church.
The use of the term Roman Catholic Church was widely used during the 16th century. It was the term designated by the Anglicans to mock and insult the Pope and the Catholics. It has also been used by the Church of England to differentiate itself from the Church of Rome because the Anglicans themselves claimed to be true Catholics too; thus, referring themselves as Anglican Catholics.
Moreover, the Church of Rome is the only one being referred to as the Roman Catholic Church and NOT the Holy Catholic Church in totality. The church in the Philippines is also called the Roman Catholic Church for it follows the Roman or Latin Rite (which is the Liturgical Rite of the Church of Rome) as well as those other local churches which also adhere to the same rite.
Nonetheless, the entire Holy Catholic Church is comprised of the Church of Rome (Roman Catholic Church) and twenty-three (23) other sui iuris particular Eastern Catholic churches (with each own unique litugical rites) united under the pastoral care of the Successor of Peter, His Holiness the Pope.
The fact is: The followers of Christ were mocked by means of calling them Christians, and the Christians, who are at present known as Catholics, were again mocked by calling them Roman Catholics. Jesus Christ said, “Blessed are you when people insult you, persecute you and falsely say all kinds of evil against you because of Me” (Matthew 5:11).