You can't talk about divorce without first understanding what marriage is. To be divorced is to be literally unmarried, and it would be like talking about haircutting for bald men, or glasses for blind people, if you don't first ask what the thing is that haircutting and glasses are for. You need to know what hair is and what eyesight is for. So it is with marriage.
Marriage in the Orthodox understanding is a sacramental bond for life. It is meant only to be done with one other person and no others. That already makes remarriage itself problematic, and the Church's dealing with it as it would with any brokenness. It is an icon of Christ and His Church. Christ will never divorce His Church. It cannot be broken in a repentant state. If one HAS broken it, they must repent; that is, be sorry that they did, NOT consider it "the best/right thing to do", but something that shouldn't have been done. That's what repentance means in terms of marriage and breaking our sacred vows and befouling the sacrament.
Remarriage shouldn't happen in the Church. It can and does happen, and some, even here, are remarried in the Church. Economia, meant to be mercy, increasingly gets misunderstood and taken as a pass to do it again (I do not say that anyone here consciously thinks that). Some even imagine that they can do it three times "legally", as if it were a legality, rather than a sacrament. A person is not supposed to be baptized twice in the Church; neither are they supposed to be married twice. A remarriage has to involve a repentant state toward the divorce of the first, which would have to be irrecoverable. And here I'm only talking about divorce. The death of a spouse is another issue, but we can see that the ideal is the same. People ought not to remarry, that is the ideal; if they do, it can only be under economia and repentance, and it must never be held to be a perfectly normal thing for us to do.
But the main thing that I find intolerable and anti-Orthodox is when two spouses both declare repentance and a determination to remain in the Church and follow Christ, yet not reconcile, but go ahead with a divorce. That's against the entire spirit of the Gospel, of having to forgive our enemies and learn to love all. I can't see such a divorce as legitimate, but a profanation of any economia ever allowed. If anyone can be divorced sheerly because of a sense of unhappiness, then we can all be divorced. Nobody's marriage is sacred, everybody is with someone until they tire of them - that is the world, and not the Gospel. It's an attack on all marriages, including mine. So yes, I take it personally, because it means that my wife can similarly divorce me on the same basis when she feels like she's tired of me, or vice-versa.