Other than an angry look or a frustrated "huff", I've not received a cogent response to my observation that if a vaccinated person feels the need to wear a mask (setting aside the fact that a mask is completely, totally, 100% ineffective in controlling transmission of a respiratory virus), then they clearly do not believe that the vaccine they have moving around in their blood really doesn't protect them -- not really. Either that or they must believe the vaccine only works if they wear a mask ... and if I wear a mask when around them ... to which I add, "Some 'vaccine', huh?"
(Gets 'em every time. This 55-year EHS professional with many years of hands-on experience with PPE sees right through all of this .... all of it!)