it does remind me a lot of the Protestants accusing "Pope (insert name here)" for being the Anti-christ or the false prophet out of the Book of Revelation... But that would be Anti-Catholicism too..
In Koine Greek the word antichrist is a compound word combining the prefix αντί-/anti- (which can mean (A)"instead of" or "in place of" as well as (B)"against") and the word Χριστός/Christos (Christ).
Since the term "vicar" (from the Latin vicarius, "substitution") carries the same meaning (A) of the Greek prefix αντί- it is literally correct to say that Roman Catholicism itself teaches the pope is the anti- ("instead-of") Christ in the sense of definition (A) though not in the sense of meaning (B) "against" or "opposed to") Christ.
Commentators are unsure which meaning of αντί- is intended in NT usage of the compound αντίxριστός. *ducks head in case others do not see the humor*
Orthodox Christians have, of course, traditionally rejected the later Roman Catholic doctrine that their pope is the antichrist in the sense of (A) (the Vicar of Christ/the instead-of-Christ); Orthodox do not need an antichrist (type A or B) in their hierarchy; Christ Himself is in our midst. *ducks head again*
 Cf. also "Vicar of Christ," New Advent http://www.newadvent.org/cathen/15403b.htm
"In virtue of his office, that is as Vicar of Christ and pastor of the whole Church, the Roman Pontiff has full, supreme and universal power over the Church. And he is always free to exercise this power. The order of bishops, which succeeds to the college of apostles and gives this apostolic body continued existence, is also the subject of supreme and full power over the universal Church, provided we understand this body together with its head the Roman Pontiff and never without this head." -Vatican II/ Dogmatic Constitution of the Church Lumen Gentium, November 21, 1964 http://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_const_19641121_lumen-gentium_en.html
“For the Roman Pontiff, by reason of his office as Vicar of Christ, and as pastor of the entire Church has full, supreme, and universal power over the whole Church, a power which he can always exercise unhindered.” CCC, 882
“...our Divine Redeemer also governs His Mystical Body in a visible and normal way through His Vicar on earth...He rules it visibly, through him who is His representative on earth... They, therefore, walk in the path of dangerous error who believe that they can accept Christ as the Head of the Church, while not adhering loyally to His Vicar on earth. They have taken away the visible head, broken the visible bonds of unity and left the Mystical Body of the Redeemer so obscured and so maimed, that those who are seeking the haven of eternal salvation can neither see it nor find it... the person of Jesus Christ is represented by the Supreme Pontiff... Above all, it is absolutely necessary that the Supreme Head, that is, the Vicar of Jesus Christ on earth, be visible to the eyes of all, since it is He who gives effective direction to the work which all do in common in a mutually helpful way towards the attainment of the proposed end..." -Pope Pius XII, Mystici Corporis Christi, June 29, 1943