Anti-Vaxxer Co-worker is driving me nuts!!!!!

I have a co-worker who believes “kids getting sick is the natural way for them to develop their immune system.”

Me: what happens if they don’t recover?

Him: well its the only way for them to develop their immune system.

Also all sicknesses can be cured by natural honey, vinegar and essential oils. I used to just find some topic to change the subject before my head exploded, but now he brings it up every day.