What does "NOT get it" mean? Seems like such an imprecise term to use when you yourself are demanding such precision.
No. It’s actually quite clear. You don’t get the thing the vaccine is against even when exposed. Jabbed by a rusty nail? Oh but you’re up to date on your vaccines, so you DON’T GET tetanus. Hang out with the wrong folks and get exposed to all three parts of MMR, but lucky you, you vaccined up, so you get neither M nor the R. It’s a pretty straightforward concept, unless you’re trying desperately to make a strawman, and failing.