Person I knew would not accept transfusion of vaccinated blood

The guy who I went to high school with, very conservative, has had a lot of medical issues and thought he might need a blood transfusion. He claimed that he would not accept blood from people who had been vaccinated.
I myself went to the hospital today and they did ask me if a blood transfusion would be OK and I said yes without hesitation or qualifications.

I can only imagine this is even possible unless you got people from your own family who you knew we’re not vaccinated to provide blood for you. This is definitely a Q anti-VAX thing. Has anyone else run into this?