<human>: Can you give me the gist of the text in a nutshell?

On Monday, my grandma passed away. She lived a long, good life and died in her sleep, so I have felt very little sadness over the passing other than the fact that I will never get to speak to her again. It was a long time coming and she was mostly bed-ridden and could barely talk/recognize anyone, so this wasn't a shock by any means. I'm happy that she's now in a better place, rather than holed up in a nursing home.

After she passed, all of my siblings (3 of them) wrote these long, heartfelt messages on Facebook about what a wonderful person she was. I elected not to do this because

A) I find it somewhat obnoxious when people put up these longs posts on FB about people/events that no one else on their list knows about or is affected by

B) I'm a fairly private person

C) I don't post on Facebook much, if at all

I loved my grandma dearly, but to announce this on Facebook to a bunch of people who have never met her just isn't something I care to do. My mom wrote me a very scathing email this morning about how all of my siblings had written a beautiful tribute, and 'any good grandson would do the same'. I realize my mom is hurting right now, but her comment cut deep. I want to hold my ground as I originally didn't think I did anything wrong, but now I'm starting to feel like a bad son/grandson. Any thoughts? Am I being an insensitive ass?
<bot>: Grandparent passed, I didn't acknowledge it on social media and my mom told me I was a bad grandson because of it.