That has happened to me several times but two stand out in particular. My sister moved to live from the UK to San Francisco and invited me over to visit in January. I made the fatal mistake of posting something about having had to go to the Emergency Rooms in my local hospital because I had a chest infection and therefore soaring blood sugar levels to get checked out.
A day later my sister sent me an e:mail to say that I was uninvited because I had diabetes and she did not want to have to deal with me being ill and going into hospital! That is from my sister!!! She is well known for being unsympathetic to illness - she has dropped many a friend who has been ill and is highly critical. She even dropped me for 5 years because I was still talking to my mother, who is an alcoholic.
I had to send her a 5 page e:mail explaining that it is possible to control blood sugar levels to a degree (I am not very well controlled because of various problems, but I was not going to tell her that) and that all I have to do is to eat regularly and I can deal with that myself, and that hypos are easily dealt with. Just take a sugary snack and then eat. To cut a long story short I did go eventually and had a wonderful time and managed to stay out of hospital! I did have a hypo in her prescence and I could not impress on her the urgency to get something to eat enough. She was trying on clothes and was only bothered that my face was wet and that it did not look nice, and why did I not dry my face? The reason I went low that time was because she insisted on walking to where we were going, though I knew of a tram - and has anyone ever walked up those hills in San Francisco?
The other time was when I was wanting to help out in a restritution course in the local prison. I went once and thoroughly enjoyed it, and then I had an e:mail to say that I was no longer required - because I am diabetic.
I try to look at it that it is their loss - but the rejection does hurt!
Another time - my Mother refused to take me home to Latvia because I am diabetic and she would not want to deal with it!