First, you know if the Spirit Of God rests on them based on how they love the brethren and their fruits. If what you say is true, you have nothing to fear as the power of God clearly rests on your side
They hate the Catholic Church so much because the truth is not in them and they are of the world, because why else would you be so blessed to be hated for being a follower of Jesus Christ and as a servant of the truth
You are blessed God is not a God of fear but a God of love.
You don’t need to resort to their tactics of uncharitability—in fact, according to what you say, they don’t even love their enemies. Sounds to me they are false prophets and chaff and by their deeds they are exposed for who they really are—children of Satan.
This is my practical response but telling them this will get you nowhere. So my advice is to love them, even turning the other cheek if you have to. I know it’s difficult. Just love them and hear them out why they don’t like the Catholic Church and by seeking peace and making friends with them with charitability and praying for them too (and yourself as you engage them), perhaps the truth will prevail, or at least, the divisions will be reduced. Baby steps, my friend, baby steps. It’s better for you to find what you have in common anyway and not try to win the battle. Just love them even if they don’t love you. I know it’s hard, but we have God on our side and the seven gifts of the Holy Spirit. If anything, your trial is an excellent opportunity to cultivate the virtue of fortitude and witness to them what it means to love those who hate you and love your enemies and forgive and be merciful. They will get to know what true christian charitability is all about.