Thankfully I don't associate with those kinds of people. Most of my family aren't aware of this stuff so I educate like they hear a news story and I usually correct them on certian points and they'll listen to me.
Anti vaxxers are weird, vaccines are there to avoid diseases and infection have been proven to work, only thing I get is cold now and then. Some numpties believe vaccines give autism which I thought was something you are born with.
I completely disagree with anyone who denies science, yes science doesn't know everything because if it did it would stop.
Not all vaccines are helpful. Noticed how quiet everyone is with the swine flu vaccines? go figure.