The church I was a part of for a while was decidedly and without apology “anti-Catholic.” The Catholic Church was interpreted to be the Whore of Babylon from the book of Revelation, and the Pope was the anti-Christ. Preists and nuns dig tunnels between their residences so they can have illicit sexual encounters with each other and then hide the babies that result. You have no idea just how much of this is out there in people’s minds about the Catholic Church.
These Bible-believing, Protestant preachers and congregants were not just on a mission to win converts to Christ. They were on specific missions to save people FROM the Catholic Church. I knew a man who claimed that it was his calling to reach out to Catholics as his “ministry” so that they might be saved. They do not regard Catholics as Christian, and they are VERY, VERY anti-Catholic. If you’ve ever read some of the tracts they hand out to people you would have a better idea. Sad, scary, and all too true. I lived with some of these people.
Yes, kind of scary and saddening… I know what you mean, I was in a slightly similar situation. I saw that Protestants have done away with the Eucharist, and that seemed like a mistake to me. However, their criticisms and misconceptions about the Pope have somehow gotten under my skin, and unfortunately I wasn’t smart enough to read up and find out the truth. Then, when I met an Eastern Orthodox woman belonging to a Church (a Russian Orthodox Church called ROCOR) that preserved priesthood and the Eucharist, but rejected the Pope (based on misconceptions similar to that of the Protestants), that was almost like the perfect storm for me. I almost left the Catholic Church and became EO! And the one thing that saved me from making that mistake, even before I had a chance to learn enough apologetics, Early Church Fathers and Church history, was the very hostile attitude of this particular EO Church towards the Catholic Church. They ridiculed our saints (St. Francis of Assisi, St. Theresa of Avila, St. Therese of Lisieux), the apparitions of Our Lady to members of the Catholic Church (i.e. Lourdes 1858, Fatima 1917), the Eucharist within the Catholic Church, etc. They were so hostile and sarcastic, they even passed a blanket judgment on all Catholic Saints, saying they were all victims of pride, self-aggrandization, and hallucinations, when they claimed that they had apparitions of Jesus Christ, Mary, Angels, etc. And, “obviously”, St. Francis’ stigmata were due to self-suggestion (although stigmatist Padre Pio told to a skeptic to go home and concentrate very hard and imagine that he is an oxen, and let him see whether he will grow horns

). Well, my worst experiences are related to an EO Church, but what led me to them had a lot to do with constant criticisms and false assumptions from the part of Lutheran, Presbyterian, Baptist, Fundamentalist Christian friends, and my unfortunate mistake of believing those criticisms too easily.
It seems to me that inspiring the division of the Church and the formation of splinter groups (whether Orthodox or Protestant) was one of the most destructive actions of Satan. It greatly weakens our ability to lead non-Christians to Jesus and makes it so much harder for the seekers of Truth to find Jesus Christ’s true Church, surrounded by these “decoy” Churches that teach an incomplete and distorted version of the Truth.
However, coming home to the Catholic Church and understanding that this is the final destination and place of full revelation of God’s Way, Truth, and Life for mankind, has its own sweet consolation. This consolation, this inner peace found, is more than enough reward for the heavy price which in other times and places (even today) may be as high as martyrdom, but more often something lesser but still very painful such as our friends and loved ones turning against us.