I've seen the idea attributed to Alexander Khomiakov as well, though I don't know if that's who it originated with (or if he even said it). But regarding anti-Romanism, I think a lot of the debates are with 3-4 posters on each side, and there just happens to be some vocal and prolific Orthodox posters who post in these threads. 3 of the top 10 people on this forum, according to post count, participate in these threads often. When you consider that 3 of the others in the top 10 don't even post any more, it's actually like 3 of the top 7 people who still regularly post here participating in those threads. I don't think this answers it, exactly, but it's probably part of it. Regarding Protestants, fwiw we have a stickied thread for answering Protestant ideas or objections (which I wish more people would participate in), and I think the interactions between various groups is a fairly nice mixed bag on this forum. That's my perception of things anyway.