Dealing with antivaxxers

Beatrice • Polyamorous crazy cat-lady living in Italy. I had a baby and I love her so much... 😍

How do I deal with people trying to push their antivaxxer agenda on me and my baby, without getting too worked up and losing my sanity? I need to make sure people that come in contact with me and my future baby understand how important it is, but discussing this topic makes me very anxious, mostly because I find it really hard to process the fact that it's almost 2018 and there's still people around that believe vaccines aren't necessary. It makes me nauseous only the idea I'll have to deal with that kind of people... How do you cope?