In my personal experience?
The fact that they refuse to do so unless I’m also Catholic.
And I’m not.
So I’m a filthy heretic.
Maybe other people have different experiences, but that was mine.
Perhaps you're both wrong in letting this be an impediment.
>>So I’m a filthy heretic.
And Catholics have heretical views according to Evangelical theology. It is still possible to disagree without being disagreeable and to strive, however imperfectly, to jointly and cooperatively seek the truth. From the article:
"We Search Togetherthanks for your reply...Together we search for a fuller and clearer understanding of God’s revelation in Christ and his will for his disciples. Because of the limitations of human reason and language, which limitations are compounded by sin, we cannot understand completely the transcendent reality of God and his ways. Only in the End Time will we see face to face and know as we are known. (1 Corinthians 13) We now search together in confident reliance upon God’s self-revelation in Jesus Christ, the sure testimony of Holy Scripture, and the promise of the Spirit to his church. In this search to understand the truth more fully and clearly, we need one another. We are both informed and limited by the histories of our communities and by our own experiences. Across the divides of communities and experiences, we need to challenge one another, always speaking the truth in love building up the Body. (Ephesians 4)
We do not presume to suggest that we can resolve the deep and long-standing differences between Evangelicals and Catholics. Indeed these differences may never be resolved short of the Kingdom Come. Nonetheless, we are not permitted simply to resign ourselves to differences that divide us from one another. Not all differences are authentic disagreements, nor need all disagreements divide. Differences and disagreements must be tested in disciplined and sustained conversation. In this connection we warmly commend and encourage the formal theological dialogues of recent years between Roman Catholics and Evangelicals.