I think they sometimes misunderstand what we say, the same as we sometimes misunderstand them.
When Orthodox say that we don’t share the Catholic understanding of original sin, Catholics assume this means we believe that we inherit no corruption of our nature, no lack of grace, no alienation from God, etc. Orthodox commonly believe that Catholics teach that we inherit the
guilt of Adam’s sin, and this is the main point they disagree with, but as I learned Catholics
don’t in fact believe this. For example, take the following statement from the Question & Answers section of the website of the Orthodox Church in America:
“Concerning the original – or “first” – sin, that commited by Adam and Eve, Orthodoxy believes that, while everyone bears the consequences of the first sin, the foremost of which is death, only Adam and Eve are guilty of that sin. Roman Catholicism teaches that everyone bears not only the consequence, but also the guilt, of that sin.”
oca.org/QA.asp?ID=3&SID=3
Now take what the following statement from the Catechism of the Catholic Church:
“Although it is proper to each individual, original sin
does not have the character of a personal fault in any of Adam’s descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering and the dominion of death, and inclined to sin - an inclination to evil that is called concupiscence”. Baptism, by imparting the life of Christ’s grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle" [bold mine]"
I personally have no objections to this understanding, and wish that more Orthodox would take the time to understand the Catholic faith before publishing responses to it.