It became a bit of a badge of honor for some people, and a filtering mechanism for those looking for other like minded people.

I was a COVID nutter, but never quite bragged about my vaccinations. I just got the bloody things and encouraged others in the hopes that we could eradicate the virus. OTOH, there were times I was viscerally upset at others online for not being willing to double down and do everything possible to fight the virus, and I've always said it's hard to let go because as the Occident, we're supposed to be in control and on top of viruses.