
I'm almost, but not quite, speechless at the way your D spoke to you and TBH some of the 'reasons' respondents have given for her attitude.
Whether she was busy, having a bad day, enduring PMT or all 3 at the same time, there was IMO no need for her to be so rude. There are far more polite ways to cut a conversation short.
I'm so sorry that you're estranged from your son and GC and have been for 5 years. We are too for 5+ years and it's a terrible thing to have to live with.
When I read your post, I remembered the hours and hours I would spend listening to our ES "whinge and moan about everything under the sun", and I did so for exactly the same reasons that you do.
To be cut out for such a small thing is beyond cruel, as was our cut out although we still haven't been given the real reason(s) why. It made me for a time, think about my relationship with our other son. Should I behave differently? Should I be a different person, change from the person I'd been his entire life? I thought about those things because I was afraid we'd lose him too.
But I didn't change; too long in the tooth, too set in my ways, too stubborn or probably all 3 and yes, our relationship has changed. It's become stronger since we lost his brother; become more important to all 3 of us.
I understand you being worried about saying anything at all that might lead you to being cut out by your D, but is walking on eggshells the kind of relationship you want with her for the rest of your life?