Not Understanding Me.

Hi,

I was diagnosed at 43, a year after my mum died.  I live with my sister, who has an autistic fiancé.  I send her lots of information (often in meme form) about the parts of my condition that relate to me, but she still doesn't understand me.

Just now, I started to do something on my computer.  She came in and asked me to look at something of hers.  I said 'okay, as soon as I've done this' and she shouted at me for being rude.  How was I rude?  Just because I didn't immediately drop what I was doing to look at her thing?  She said it was my tone.  I reminded her of information I've previously shown her about autists' tone.  She knows I'm not a self-sacrificing Care Bear, and I shouldn't have to pretend to be different from what I am.  I purposely tried to say exactly what she says to me when I ask her to do something.  I guess she wouldn't like talking to herself.  

My mum used to always say that I was being rude when I don't believe I was.  It's so hard to live with my sister.  I can't move out of home, and she's not getting married any time soon.  We have the same GP, so I don't know if I can talk to him about these things.