I didn't say forgive. I said honour. To honour someone effectively means to respect them for their actions.
Well, I did say "whatever that might look like", and "Truly, truly forgive them", etc. And I think there are many, many different ways to honour people without showing overwhelming approval for their past actions, etc. Part of forgiveness, honour, etc, is love, and I think if you can still find a way to love them, then you've more than effectively honored them, and still do honor them if you still do love them, etc.
But it's not easy to do in situations like that, and it will probably be a process, but as long as you're still working on it, and working through it, with the goal to find a way to still love them, and always love them after that regardless, then I think you are effectively honoring them to the best of your human ability, or the best that can be expected out of any human being in a situation like that, etc.
Children who are right now in it, while it's not a good situation to be in, still have to try to obey their parents best they can until they are of age, or can get out of the situation, etc, but once they are out and away, and once they are maybe a little bit older, regardless of how bad it was, it won't do anything to the parents to keep staying angry or bitter or unforgiving, but will only hurt you and all your present relationships, and you'll need to begin the healing process from that eventually, and it starts with finding a way to truly, truly forgive them, with the eventual goal of finding a way to love them again somehow, etc.
I know a teacher/preacher who was done very wrong by their parents, and who said they were told by God to personally help them and take care of them in their old age, and they said when they first heard it, the first thing out of their mouth was "I rebuke you Satan" but it kept persisting, and it wasn't Satan, and their parents did them very, very, very wrong, so they thought there was "no way that could be God", "after the way they treated me" (they said), etc, etc, etc, but they kept hearing it again, and again, and again, etc. They eventually did it, and said that while it was not easy, they were able to have a relationship with their parents again, and found a way to be around them, and to love them again, and it wasn't at all about their parents, but it was about them, and they said such a huge weight/burden was lifted off their soul when they finally did that (forgave them/let it go/learned how to love/have a relationship with them again) that it healed something deep within them that very, very much needed to be healed that was very, very broken, and all their relationships that they had with all of the other people in their lives all of the sudden became 1000% better, and they said that by finally and truly forgiving their parents, and learning a way in which they could love them again, that it was them who was healed 1000% completely.
Anyway, too long a post already, but my point is, and I think the preacher even said this, that if it were not for doing that with their parents, they either maybe could have missed out on eternity, or they would have been carrying a very, very huge weight into eternity, and might have been treated like a poor little wounded bird (victim) when they did finally get into eternity, instead of the victor they had become through learning about love and forgiveness, by loving and forgiving their abusive parents, etc.
Also Honor/honour in the Bible I don't think has the same modern day dictionary definition or meaning that it may have today I don't think, etc. Back then, it had many different meanings based on sometimes how old you were and whether or not you were still a child or were a grown adult for example, etc. The Bible never mentions approving of someone's acts or actions in order to honor them for example, etc. And many times it commands it/that despite them, and despite them not being the best, etc.
Take Care/God Bless.