If I was in your position, I would go anyway. That is your son, that is your granddaughter. That lady has no authority to demand testing, or to tell you that you can't go. I would most definitely go without being contentious, and I would leave it up to her if she wants to stay or leave.
The people going through this don't deserve it. Who cares if they were dicks and mocked the non vaxxed, they are our fellow men and women. No one deserves this. No one. Let go of your grudge. We are in this together, vaxxed and non vaxxed.
Just want to add a word of advice to the conversation: Please be careful as you don't know who might show up to pretend to help. Do background checks on those who offer. We all know that there are individuals here that don't have good intentions. Other than that I wish you luck and hope that your project turns out great.
Sorry for your loss. I have not gone through what you are experiencing, but it must be the hardest thing anybody has to go through. Your feelings are perfectly normal, life is unfair and what you are expressing is ok. Some might say stay strong, but you have all the right to break down and cry. Don't hold the pain in or it will hurt you.
I get your point. They can go out as long as they flash their proof of vaccination, regardless of if they tested positive, while unvaxxed wont be allowed to access some establishments even if we never had covid. Pretty stupid if you ask me.
You are assuming that the woman in this video is not an innocent victim. Taking the vaxx because she was coerced or scared into it doesn't make her guilty of anything. She also has to suffer with whatever side effect she gets. Grow a heart.