I think this attitude is a combination of misunderstanding on the Latins' part of what the Eastern churches are, and the Eastern churches' members feeling perpetually distanced because of the fact that they merely practice a form of the same Faith that is different from the Western heritage.
I started worshiping in a Melkite church when I lived in New Jersey a couple of years ago and even after explaining to my mom "They're in union with the Pope,it's just different customs around the same Eucharist" she still immediately asked "but they're Catholic right?"...I think I understand where you're coming from if I, as a Latin, may say so
