When Writer and Beta Reader Disagree

The article on losing your voice in critiques is especially important to me, because I do have a strong voice, and when betaing, can really come on strong, even lean on a person.
Sometimes it does benefit the writer, and a scene might find the new direction it needed. But other times, I suspect it stifles the writer, stonewalls them with writer's block, and creates dissatisfaction with their own work. They might not say so, but the tension's there, to please, to meet each others needs and wants without destroying the work, or the relationship.

The writer must ask themselves if the suggestions work for them, will the change improve the story, and will it change it so much as to be unrecognizable to the story you wanted to write in the first place.
If it's a quibble over what words to use, he looked vs he glared, those things can be decided without much effect on the whole, and only little tension for the reader and writer. But if it's the difference between showing angst vs humiliation, murder or self defense, you might butt heads.
You've probably run into both a problem of morality, and that of one person wanting the character to be shown in a different light.

The writer's best bet would be to kindly remind the beta that this is how they want the story to be. Sometimes we betas forget it's not our story, and we'll just keep pushing. And the betas job is to finish the critique, even knowing the story could be different, and that it's not going to happen. Or, one or both of you, could throw in the towel and admit you weren't meant for each other.
Don't let giving up get between what you've already learned from each other. What you're doing is saving yourselves the heartache of trying to change what you can't, and the story's original premise.

Most of us are lucky to find someone we love to work. They can see our vision, and when we're stuck, lead us back in the right direction.
Sometimes we get someone who doesn't have our vision, but often they've different, and even important contributions, showing us something we'd never have looked at before.
All beta-writer relationships have something to offer, even the tough ones. Don't let a beta get you down, or change your story from what you want it to be.