Not so much an AIBU but more a how would you respond?
(Long time lurker, first time poster, please bare with me etc!)
Back ground... 16 years ago I was diagnosed with a condition which means I am gradually losing my sight - potential to lose it completely, but the hope is I'll always retain SOME useful vision - obviously at the time I was devastated and really thought that was the end of any meaningful life for me. I didn't & still don't 'look blind' (not sure what blind is supposed to look like, but clearly I don't fit the stereotype that most have!), but was/am blind enough to be registered severely sight impaired & for guide dogs to think I'd benefit from a guide dog.
Eight years ago I was matched with my amazing guide dog, apart from the obvious, he made me realise that meaningful life wasn't at an end, but just a different route to the one I thought I'd be taking!
At the time one of my then closest friends (shall we call her Edna?!) told me that I would not be allowed to take my dog to her house as she doesn't like them, while I was a bit upset I accepted that as it's her home and she gets to decide who & what goes there so said we'd be meeting in public or at my house instead... initially this was fine, but after a couple of years she started to complain that I never made any effort to go to hers. I pointed out that she had an issue with my guide dog going to hers and that was why, she accepted it for a while but then the little digs started up again and it became a real cycle... meeting up for a while, the digs starting, me having to remind her that I'm visually impaired and that he's my guide dog and essentially a mobility aid, he enables me to get from a to b safely etc, her grudgingly accepting it and then the cycle starting again. She's had a child since then and now the reason is her child is scared of dogs (again, that's fair enough, I'm not one of these people that thinks the world and his wife is going to love my dog in the same way I do, but he really IS lovely 
)
Obviously, this has had an effect on our friendship! It's boring and to be quite honest I find it disrespectful that I had to continuously remind her WHY I no longer spend time at hers (HER choice) and we are no longer the close friends we once were. But we do still occasionally meet up for a catch up meal/drinks, there was no big falling out it was just a gradual parting ways sort of thing. As such I no longer invite her to all the things I would have once invited her to.
On Saturday I had an impromptu get together at mine in the afternoon for a few hours, some old and new friends, some other guide dogs & their owners, friends with kids & mine, a paddling pool, food and just a nice afternoon. Naturally, pictures and posts were made on stage whispers Facebook - and last night....
I got an incredibly ranty message from Edna, calling me the worse friend she's ever had, why hadn't I invited her on Saturday, why did I always use the dog as an excuse not to go to hers, I should just leave him at home, I had and continue to exaggerate the extent of my sight loss, calling me an attention seeking fraud and much more... 
It's REALLY upset me! I basically want to message her back and say 'YOU'RE the cunt that decided my taking steps to deal with MY sight loss doesn't fit what YOU want in a friend and that's why we're no longer fucking close!' With a few more swear words added in probably to be honest... 
But what I really want is a clear fuck off and fuck you message without actually saying that so the least drama possible can escalate from it...
Suggestions gratefully received! And congrats I feel you made it to the end of this epic first timers post 