Why do complete strangers tell me their vaccinated as soon as | Covid 19 Vaccine...What They Don't Want You...

Why do complete strangers tell me their vaccinated as soon as they see me in the lobby or elevator or elsewhere? Some of The ones who don't verbalize it actually have it written across their face diaper or they're wearing a big yellow button on their shirt. Is it virtue signalling or are they actually sincere thinking they are doing me a favor? #VaccinationStatus