It's pretty easy, I remember I used to have a similar smug sense of superiority that was very clearly misplaced. People making these types of comments especially on forums lied reddit because (no offence redditors) it attracts a very specific type of person (mostly guys) rather than a homogenous blend of the real diverse world made of real diverse opinions.

If you feel the comments getting to you then close out the window, avoid the topic, recognize that people are entitled to their opinions but also that their opinions may be coming from a place of misunderstanding and insecurity where your options are either try to educate them (which does not work) or let them figure it out themselves whenever they choose to explore the topic themselves.

I have noticed in real life that the comments I have heard from taking baby steps to experimenting in makeup over the past few years have transformed from "that's too much", "you shouldn't wear so much makeup", "makeup is only for special occasions" etc to "your complexion looks beautiful", "the blush is a great colour", "I like your eyeshadow", "that's a great lipstick, where did you get it?", etc and THAT feels really good because it's a clear indicator that these people have not only opened up to the dynamic nature of makeup but also that they don't automatically make weird assumptions about people. This also includes my mother who was very much against me wearing makeup because she believed it was only ever for special occasions but now makes a lot more supportive comments, she didn't realize it's the awkward terrible repeated practice that put me in a place where makeup now looks easy, beautiful, and elegant.