>>542334
While this schism between Rome and Constantinople didn't help geopolitical and social relations, it wasn't seen as a huge deal by the other Patriarchs. We know from the Patriarch of Antioch's epistles to another bishop that the schism was seen as a personal thing between Rome and Constantinople, that didn't split the Church in half, and that was mostly caused by Ecumenical Patriarch Cerularius's bad temper and tribal hatred for the Latins. But Rome was not seen as innocent either - the filioque is a real issue, that must be addressed, because it is a doctrine that no one in the East understands (and that many in the West do not understand either, as history had shown before), and it is an interpolation to an ancient and ecumenical creed that had become the global statement of faith of the Church, at least in the East. The Patriarchs thought they would simply deal with the issue with the Pope in a brotherly manner later, and the issue was swept under the rug.
Later on, the Crusades happened. Hoping to soften the relations between the Byzantine Empire and the Holy Roman Empire (well, among other, much more important issues, but this is a relevant one), the Byzantine Emperor, Alexios I Komnenos, asked for military help to retake the Holy Land from the Muslims. Pope Urban II responded positively, and the First Crusade took place in 1095-1099, however, it actually worsened the relations between Western Christians and Eastern Christians, because of the cultural and liturgical shock, and the creation of the Latin crusader states. The Second Crusade took place in 1147-1149 and was a disaster. By this time, the relations between Constantinople and Rome had gotten to the point of pure ethnic hatred, leading to the Massacre of the Latins in 1182. The Third Crusade took place in 1189-1192 and was another disaster.
At this point, relations between Eastern and Western Christians were pretty bad - those of Constantinople had nothing but hatred for the heretical, schismatic, uneducated, sub-human Latins; those of Alexandria, Antioch, and Jerusalem were getting increasingly frustratred by the failures of the Crusades and the Latins' behavior; and the Romans increasingly (if not completely) saw the Eastern Churches as being separated from them, and them of course being in the right. What began as a doctrinal dispute fueled by geopolitics and hubris, turned into a game of ethnic hatred between the two halves of the Orthodox Catholic Church.
Then it blew up with the Fourth Crusade (1202-1204). Constantinople was ransacked by crusaders, and its people shown no dignity in the slightest. And while Pope Innocent III first condemned the catastrophe and excommunicated those responsible, he then changed his tune once he found a practical aspect to it: with Constantinople ransacked, the schism could be solved by having Latin occupation in Constantinople make the Constantinopolitans follow the same practices, thus creating a standard to be followed by all: that of Rome. The Pope justified the sack of Constantinople by calling it divine punishment of the Greek heretics, and went on to proceed with his plan (which failed atrociously).
With the horrible behavior of the crusaders, and the cynical reaction of the Pope, the hatred for Rome that was originally Constantinople's spread over to the other Eastern Churches, and Constantinople was recognized as having been right all along after all: the Latins are heretics, schismatics, God-less, prideful, and so on, and their different practices and theology (the filioque, the use of statues, the use of unleavened bread for the Eucharist, clerical celibacy, etc) prove it.
I'll continue in the next post…