

My explanation is simpler: “The body learns how to fight diseases by eating killed viruses. A vaccine gives you dead viruses, so your body can learn without having to get hurt first. A measles party uses living viruses, so your kid might suffer death or worse.”
Then show them the results.
Probably not accurate in detail, but hopefully good enough. If not, then the brevity will let you move onto someone who hasn’t abandoned their brain.
If you dare speak on how the Tree of Liberty needs watering with the blood of patriots and tyrants, you get auto-banned. Reddit has been a fascist in sheep’s skin for at least a decade.