People who think they've found the best spiritual path have a right to proselytize, but sometimes it's kinder to refrain.
The concept of a faith "lineage" has little weight in America; here we switch easily from one denomination to another, without feeling an obligation to uphold the church of our grandparents. But in some other lands, loyally upholding inherited faith is valued. Russia recently celebrated a thousand years of Orthodox faith, and other formerly communist nations go back centuries more. This spiritual inheritance is alive and important to them, and continuing it is an obligation and honor.
Americans may see this as silly, but failure to understand the Orthodox viewpoint makes for unintentional wounding.
One more factor complicates this picture. It is that these Orthodox lands have just emerged from decades of oppression and persecution. As the USSR cracked down on institutions at odds with state-sponsored atheism, some 20 million died in Russia alone. Brave Protestant missionaries like Pastor Richard Wurmbrand tried to tell Westerners this at the time. American response to this persecution was weak and confused because it was hard to see what, in practical terms, we could do; also, due to Cold War prejudice against Russians, the fate of Russian Christians did not seem pressing.
During this persecution, the church in these lands was severely depleted, to an extent we cannot imagine. Most of its leaders were killed, in horrible ways and huge numbers; 40,000 Russian pastors were killed under Stalin, so that at the end of his dictatorship only 200 remained. Churches were desecrated, possessions confiscated, and the faith was openly and officially attacked. One young Russian woman recently told me she grew up hearing, "Study hard, or else you'll be stupid, and then you'll turn into a Christian."
As that miserable time recedes, the Orthodox Church is severely crippled and in desperate need of support to rebuild. But most outreach to these lands has not been to strengthen what remains but to establish new, separate churches. To the Orthodox, this is cruel. They feel like what the communists started, Americans are bent on completing: the destruction of their cherished faith.
Moreover, it seems to Orthodox that Americans have unfair advantages, stirring up more bitterness. American financial resources are huge compared to that of the diminished Orthodox church. While Orthodox churches are still impoverished and in shambles, new Protestant churches can look as nice as new American churches. Also, since anything American is "cool," the church struggles against another frustrating disadvantage: the perception that it's not fashionable, while the incoming churches are.