Outside of the loony fringes of the Bob Jones' and Jack Chicks' of this world, is anti-Catholicism among most of our separated Protestant brothers and sisters really a thing of the past? In taking a look at some of the courses offered by a few of the more popular "born again" Protestant colleges in this country, one has to wonder. For example, here is a course offered at the Bible Institute of Los Angeles (BIOLA) University:

TTTH707 Roman Catholic Theology
Units:2.0
School:Talbot School of Theology
Course Description:
A detailed study of the tenets of Roman Catholicism; reading from representative Roman Catholic literature; particular attention given to the distinctions between Roman Catholic and Protestant doctrines. Especially helpful for those contemplating missionary service in countries dominated by Roman Catholicism. Elective .

Here is course offered at Trinity International University, whose law school I am a graduate of (Yes, I did lodge a formal complaint after I discovered it. As expected, they denied the course was designed to train Evangelical missionaries on how to convert Catholics):

ST 737 ROMAN CATHOLIC THEOLOGY
An examination of the claims and practices of traditional Roman Catholicism, of the "revolution" introduced by the Second Vatican Council, and of current modernist and traditionalist trends, together with an evangelical critique and an evaluation of the possibilities of collaboration with and evangelism among Catholics today.

So yeah, while secular humanism is the greatest cause of anti-Catholicism in America today, one can clearly see that some of the hostility toward the Church is still flowing out from this country's Protestant subculture.