I'm fascinated by this bizarre social rule that half the posters support and the other half (included me) are baffled and amused by. No one seems to really be able to explain why it's so dreadful.
"Common" - well that means commonplace and popular! It's been used in a nasty way in this thread to mean "vulgar" I think but I don't really understand why it's vulgar.
"Performative" and "showing off". Makes no sense. Just getting the job done. Nothing shameful about it that I can understand. Some of us look better with make up (no criticism of those who don't opt to use any). Are we supposed to pretend it's natural beauty by only applying it in deadest secret?
"Unhygienic", "disgusting", "offensive". Again just why? It's not coming into contact with others like flying nail clippings, flossed material or vigorously brushed hair might. Yet there are people in the room eating, yes, opening their germy gobs and shoving in food with fingers or utensils (perhaps they should do so in private cubicles and sterilise themselves before they come out) and tapping away on their filthy mobile screens and then (gasp) touching surfaces! I bet some of these foul individuals even talk in company, allowing their germy breath vapour to seep out into the room.
"Go and do it in the toilets". No thanks, I have no desire to apply make up to a backdrop of sounds and smells of piss, shit and farts, nor do want the fine spray of the toilet flush landing on my cosmetics. Not to mention that I have a bad knee and am uncomfortable standing for any length of time.
"Only applying lipstick in public is acceptable". Why lipstick??? Surely your mouth is the most germ and virus ridden part of your face! Again, makes no sense.
Mocking and mimicking someone IS rude and antisocial. If the colleague objects so much she can make a polite request to OP.
I'm a generally polite and well mannered person but I can and do ignore certain social rules that make no sense. I'll continue to touch up my make up at my desk or on the train if I want to. If anyone doesn't like the view they can look away. I've certainly never been told I'm common, though I've often been accused of being "posh" (I'm not but my speaking voice and education seems to suggest it).