I don't think anyone has expressed anything negative about not wearing any makeup. That's not a problem.
The issue is the perceived intrusion of being forced to witness an act that many people consider should be kept private.
Clearly the people who don't see it as a private act don't perceive it as an intrusion. Those who do, find it uncomfortable to watch.
For me, the problem is this failure to acknowledge that there are people who find it intrusive. That's disrespectful.
It is like having a loud phone conversation on the train. The people who do it just don't care that hearing their (often ridiculously) private conversation is intrusive and annoying to other people.
The sort of attitude that says, 'you know what I don't know these people and I don't care what they think, I'll do what suits me', is not being broad minded, modern minded, or demonstrating feminist inclinations.
In my opinion, it is ill-mannered, disrespectful and tasteless.