As a former protestant pastor/anglican priest, I can speak to actual protestant teachings.
If any person or church holds to the Westminster Confession of Faith, Chapter 25, vi, states the Bishop of Rome is the antichrist. I sat in a PCA church in Pensacola which taught this as do many of the presbyterian and fundamental baptist, as well as other denominational churches teach this. I had friends who were Presbyterian pastors and Baptist pastors who still hold and teach this as fact. When I became an Anglican, my mentor, a presbyterian pastor, told me I was going to hell for joining the “little whore of babylon”.

My grandfather was a Southern Baptist Convention pastor and association direction/missionary for about 60 years. He was the only SBC pastor in my area I know that did not teach that doctrine. He died in 2007. He was considered a liberal by the other SBC pastors in the area.
At the largest Baptist Church in my city, Pensacola, the pastor constantly mis-teaches catholic and calvinist beliefs. He has from the pulpit and I have heard in Sunday School classes anti catholic comments and teachings. On local tv and radio, protestant pastors of all denominations routinely teach/preach/proclaim anti catholic teachings such as Mary worship, anti-christ, whore of babylon etc. About 5 years ago, at Olive Baptist Church, the lead pastor, during a Christmas Eve service, when on about how Catholics got it wrong and worship Mary as the expense of Jesus. A Baptist friend of mine, when I told him I was converting to the Church, told me he was not happy about it, but he knew I was saved and God was probably moving me there as the Catholic Church needed the gospel.
I was constantly in trouble with my superiors and laity for being catholic friend as a pastor for not repeating this untruths.
Please do not try to say protestants do not teach these mistruths. JonNC, a fair and balanced Lutheran, has said how his confession has mistruths about catholicism in it and it saddens him. Protestants have been posting here for many years. So we know what is and is not taught in protestant churches. Many catholic on CAF are former protestants.
Mark