Am I unreasonable?

[JOJO1960]

Hello, I would like some advice on my current partner's attitude to her living son. He is never worked. He is 34 years of age, he never speaks to her or to me or to anyone who comes in the house. He takes drugs, stays up all night and makes noise and weakens me when I stay at her house. I have spoken to her many times about his behaviour and I have tried to speak to him myself but all I have received in response from him is F off
My partner does not respond me in any way when I raise my concerns about his mental health and the effect that it is having on me. What should I do do? Is it just her concern and none of my business? I wish to maintain our relationship, but I am dismayed and disheartened by the way that she disregards my feelings about the way her son is.
Thank you, Joe

Unreasonable expectations of my partner?

YANBU for not wanting to deal with a 30+ year old rude drug addict

However you would be unreasonable to make your partner choose or do anything she isn't comfortable with

If you want to maintain this relationship do so without staying at hers, make it clear why but don't force it more than that.

Parents have a natural want to protect and help their children, I for sure wouldn't be kicking my child out when they were in a clear need of help and support.