Because Orthodox Christians are such a minority in the world and do not have much of a voice, perhaps then they feel they have to get right to the point in the first sentence. (Or perhaps this is just an American thing.
) Perhaps folks learn first and more thoroughly the differences and the things that make them stand out from the crowd, but neglect to become deeply immersed in the full inner life appropriate to the true Christian. It is easy to learn the rhetoric, but takes a life-time to acquire the Holy Spirit in ones' every breath.
If he who speaks the rhetoric has love for God and he who hears has love for the truth then, even though the words may seem harsh, still they inflame the heart with love for God. Perhaps our words seem fiesty because we life in a time when ecumenism is in the air. "It's all good." "Why can't we all just get along." "We have the same God." Having the one true religion/way of worshipping the One True God, is just not an acceptable claim in these days. Growing up in the 60's and 70's it is my recollection that all the Protestant branches claimed they were the 'one'. One Lutheran branch couldn't be sure of the salvation in another Lutheran branch. Now, such a thing is not acceptable and the ecumenical movement has even drawn in those who still say that they believe in "One Church".
We really shouldn't be so defencive, there is no need. If we work on living as Christians, God will defend us. If we follow our Lord's example given in the story of the Good Samaritan, helping those whom we come across on our path, we will be plenty busy.
There is especially no need for us to condemn anyone. All of us, without a doubt, will have our reward for how we have exercised our will in this short life. Let's not add the condemnation of fellow humans to the list of things we will be required to answer for at the dread judgement.