Maybe one day, it would be mandatory to have something done to you that you absolutely freak out about.
So don't have one then, no one is forcing you to. Businesses are well within their rights to refuse you entry on that basis though.
Oh, but do go on and bleat away about how it is creating a two tier society and how it is exactly like Rosa Parks on the bus, apartheid, Gilead and so on and so forth. Absolute insulting nonsense. Some in this country just love to appropriate other people's oppression.
My Dad arrived here as a refugee in the seventees, having been booted out of his own country at the hands of an ACTUAL dictatorship, which saw several of his friends and family members shot in the street.
FWIW, I happen to think vaccine passports are nonsense. But I also have no sympathy with people who refuse them.
And I definitely think those who are feeling outraged and/or distressed by the idea of vaccine passports need to brace themselves for what climate change will bring, in our lifetime, certainly I our children's lifetimes. Most of you will look back and wonder WTF you were complaining about WRT bloody vaccine passports.