To a certain degree, and it sounds exhausting. It also varies with culture (Brits are more masked than Polish people, for instance). Now, I have discernment so I don't always just blurt out whatever's on my mind (especially around people like my MIL and my older relatives), but I don't see it as a mask, it's more on the level of holding in some farts, lol. I haven't changed my mind about anything and if something arises that would test my values I'll still just be me and act accordingly, I'm just not mentioning what comes to my mind when I see my wife bra-less, for example.
Regardless, there's us, the perception we have of us and the perception others have of us. We should at least make sure the first two are as close as possible. Also, personally, I'm too proud not to be myself, and since I know I lead a mostly harmless and somewhat selfless life, I have no moral qualms going at it raw and maskless!