I think you hit the nail right on the head that everybody sees the OP's posts through glasses colored by their own experiences.
We have a person like the OP that loves to plan. We often travel together in a large family group because we do like to travel with almost everybody. But there are always tense moments when everybody is walking on eggshells around one this one member. She has self-declared herself the family
travel agent. Anything that may be perceived as a negative comment on her plans will send her into either a tantrum or a period of passive aggressiveness accusing us of not liking her. Her plans are her definition of her self-worth. If you want to change them, you want to change her.
It is part the family's fault as we all go along, agreeing with her when she asks for our opinions. If we said no, we would rather do something else, she wouldn't listen to our suggestions and would pout and go ahead and do it her way anyway. It is just easier to nod our heads and just plan our own outings ourselves.
But when we do go off and do something on our own that is not to her plan, she becomes defensive and calls us all ungrateful *****es and *******s who are taking advantage of all her hard work and yes, sometimes unwanted spending. Just like the OP has called the bride.
The thing is, we would much rather not have her plan. She has been told this, much like the DH tells the OP, but she is deaf. She just
knows we want her to do it, convinces herself that it is our idea and then gets extremely angry when we don't want to do everything she planned.
On vacation, it is pretty common to send the same kind of texts "so, how should we handle Marge because our plans have changed and we won't be able to meet for dinner." The whole family knows what that will mean, a huge meltdown and accusations that we don't appreciate all the hard work she did getting the reservations.
So, to quote you "So even if you don't have a family member like that doesn't mean they don't exist. "
I am seeing it through the eyes of having to deal with a crazy planner while many of you are seeing it through the eyes of having a spoiled family member.
We will never know the real story unless the rest of the family comes on here and tells us why they don't want the OP at the wedding. And then the truth will be somewhere in the middle of the two stories.