An Answer

Protestants hate Catholics so much but Catholics do not hate Protestants? Why so much hate?

 They all belong to their create your own religion sects. They reject the only Church founded by Jesus and not only reject it but protest its very existence and veracity. This is evidence of a lack of the indwelling of the Holy Spirit because when one accepts Christ into their lives and believed in Him and grace becomes abundant. They are so full of pride at their own creation that there is no room for God's grace. One full of grace would not lie so egregiously and certainly not about the only Church that Jesus and the disciples founded and His faithful. They literally hate what the Church teaches and St. Paul gave us insight into why that is so. He said the following:

2 Tim 4:3(KJV): For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;

Their doctrines and beliefs are of their own creation and they seek out like minded people who believe in he same heresies. The foundation for their arrogance and pride in doing so is the heretical doctrine of Sola Scriptura and the teaching that each man is his own theologian. This has caused tens of thousands of schisms in the Body of Christ. Even the father of Protestantism Martin Luther believed that he was destined for hell for opening this Pandora's box. These are the fruits of Protestantism.

Remember the founders of Protestantism were Secular Humanists. Calvin was a Secular Humanist lawyer. What they wanted was a God that served man instead of a God that man must serve. This was definitely heterodox teaching that opened the door for all kinds of heresy. What man could imagine he could call truth instead of the orthodox teaching of the Church based solely on God's Word but not limited to the written Word but the living Word contained in its fullness in His Church.

We Catholics rarely complain about the underserved vitriol about us. I have never become angry no matter how hostile or untrue these anti-Catholics depicted the Church. Most of my fellow Catholics do not as well. We know what our Lord taught us and that is that the world would hate us as it hated Him. Jesus taught us how to react when He said that to insults we are to turn the other cheek. Why would we expect those who hate His Church and what Christ has founded to follow our Lord's teaching. They cannot even restrain themselves from bearing false witness against us. Pridefully they justify their lies as ironically doing God's work. Sin is never God's work and nothing justifies such hatred and disobedience. They do not do this because they feel persecuted but instead because of their arrogance. Certainly they believe that their own self created beliefs are of more veracity than anything Christ, the disciples or His Church could ever teach. It is the age old nemesis of man which is pride which leads to destruction. On the last day it is likely that they will hear from our Lord, "depart from me I never knew you" and they will receive their eternal reward that they have earned which is eternity in the lake of fire.

God bless!

In Christ
Fr. Joseph