To me wearing a mask implies hiding your true self. Being polite at a job when you feel like crap doesn't mean putting on a mask to me. I'm still very much myself without unloading my issues on to others.

No mask to me means that I dont go out of my way to hide anything. I dont lie. I dont pretend to be anything other than what I am. In fact in the job example if I wasnt having a good day I've always been the person to say: it hasn't been a great day, but....".

To a degree of course we all have to conform to social norms and I get that. But that isnt necessarily the same as a mask.

Not sure if I make sense at all.