One reason why you've not seen EO-OO polemics is because the place for EO-OO polemics are in the Private Fora. That's one reason why EO-OO polemics are removed from the Oriental Orthodox Forum - because that's just a place for discussion of OO topics, not the usual endless merry-go-round on EO-OO issues (which, since you brought it up, are merely a fraction of the EO-RC & OO-RC issues), which are thus restricted to the private EO-OO forum, or Free-For-All: Religious Topics.
Would it be possible for this section of the forum to be set up to discuss Catholic issues and have the Catholic-Orthodox polemics rerouted to a private section of the forum?
I had a lengthy answer, and lost it somehow. However, one point I was going to bring up has been mentioned since then, namely:
That shouldn't be surprising seeing as how similar we are to each other in comparison to how dissimilar either of us are to you.
Well, if you would be treated like second class citizens or non-citizens in an Orthodox Church (and you would likewise treat Protestants such), then how is it unreasonable to do so also on an Orthodox forum?
So I guess that is the fundamental difference between Catholicism vs. EO and OO...love versus no love.
I'm sure the Orthodox Christians raped and massacred by the Crusaders sympathize with you. Get off your self-constructed moral high horse - the part of RCism that has diverged from Orthodoxy is the only thing attacked here, not RCs. It's an Orthodox Forum, here to discuss issues of Orthodoxy; it would be incongruent
for us to have a RC-exclusive section considering our position viz-a-viz sacraments (especially Communion), history, theology, ecclesiology, etc. We can have an area where RC and EO/OO/Old-Cal discuss things together, and an area where the aforementioned groups can be more polemical (Private Fora), but that's as good as it gets. The OO's only have their "own section" here because of the unique cultural and liturgical circumstances and the fact that, if they were expected to have their threads about their issues in with the rest of the threads, they'd be swallowed up or buried by the EO stuff since there are more EOs than OOs; it's creating a nice niche so they don't have to search all over the forum to find OO-related things, respecting the fact that they're a minority in numbers but not in importance - but having the exclusive section for discussion of OO topics isn't a "pen" to restrict them. They (at least for the purposes of the Forum) are as Orthodox as EO (and vice-versa) and have the freedom to discuss their beliefs, practices, etc. freely in all the fora (Faith, Liturgy, etc.).
The difference is neither I nor most other Catholics are anti-EO or anti-OO. Heck, we even let the EO Commune in our Churches. We are charitable and loving to them yet they scoff at us and treat us like we are garbage.
If you're treated poorly by Orthodox people, then they should be ashamed. But don't use the extension of Communion as a sign of enlightenment or charity; it's a sign of ecclesiastical dysfunction. Truth be told, our Churches are not in communion at the "national" levels, and thus should not be at the local ones, either; the RC church is being internally inconsistent if it is allowing Orthodox to be routinely (i.e. not under special circumstances) communed in parishes without formal conversion.