Listen. If you don't want to take the vaccine then that's fine. You don't actually have to show up when they call you.
Just don't talk about it to people. If they ask if you've taken it either lie or just say no.
If they ask why just say you didn't feel like it, don't turn it into a debate. Just let them rip off their cocks in anger claiming that you are going to die or kill everyone around you or both. It's always funnier seeing yhese people fume than actually bothering with them.

Just for the love of god don't make a big deal out of it or start talking about things you do not understand.