It is just the attitude of Protestantism in America is much different than in Europe.
I gather (from this forum) that that is so, and it grieves me. We, on our side, get the same from Orthodox in Greece, and have done also in Albania, though things seem to be improving in Albania - not towards co-operation of course, let alone to inter-communion, but at least towards courtesy. I have taken coffee and/or raki or similar with priests and a bishop in Albania, and I understand that the trainees in the seminary and Bible college visit each other's churches as part of their course, to foster some understanding of each other.