I Find This Movie Incredibly Offensive to People with Disabilities

I get what you're saying but....these things really happen. I've seen it firsthand. Since we don't really know how Jakob's character would interpret what he's experiencing, maybe that was why it seems he doesn't have a voice. In reality, a person with this condition literally does not. How would you have given him a voice? What way would you change the story? Serious questions. I had a special needs child and I wasn't offended but I understand where someone might be. They get lost in the shuffle of everyone trying to do the "right" things for them. It often gets messy just like this and worse. :(

I don't think it's at all offensive to people like Jakob. They are likely unable to comprehend what this movie is about. Their cognitive disabilities prevent them from being able to be offended by a movie.

To find out what your problem is, I would have to view the movie and right now I'm not up to it. However, I saw the trailer and read a few reviews and it's on my watch list.
But you seem to me one of those sometimes insufferable 'feelgood' people. White folks who scream 'Racism!' without caring to know if colored people agree, or were even aware that there was racism involved. In The Netherlands we have a political party backed by such world savers.
I guess you, out of over-reactive prejudice, refused to watch a lot of funny and endearing and brilliant movies. Rain Man? The Miracle Worker? My Left Foot? Fellini's Casanova? The Marx Brothers with their Jewish self-ridiculing? Movies where the black man is the very bad guy or the black woman the total bitch? Gay themed classics? Come to that- how about the Doris Day & Rock Hudson vehicles? The IDEA that a heterosexual Aryan actress had fun with an Jewish actor she was very fond of but didn't know him to be gay! What an insult to the female race. Maybe she simply didn't want to consider such a thing, there! an insult again: to the discriminated homosexual race!
Take your pick.
Anyway, don't bother to look these titles up. I'm sure they will make you sick.

Do you have a disabled person in your family? Are you close to any?

I'm guessing *some* mentally disabled people are like this, even if some/most are not. So I'm not sure why this would bother you. (I'm guessing many ordinary mothers would address a special-needs offspring in this way.)

And abuse/disparagement of all kinds of people is sadly common. The movie is realistic in that regard, if dark. But abuse is an intrinsic element of many films, including this one.