:D! Thanks for the cosign--- as you say, it shows just how little he understands what-all goes into putting on makeup. Riffing off katiedid717's comment above about men who have sisters having more of a clue about how makeup works, I suspect LW has never seen a woman put on makeup, and if he raises the subject with his GF she should invite him to come along for the entire process--- from shopping for the stuff (with attention to how much it costs, and also any allergies or other skin issues she has) through applying it, through removing it.

And, okay, you didn't ask for all this in your inbox and maybe this should be a top-level comment, but the guy doesn't seem to have a clue why asking a woman to wear makeup is sexist, and the above part of "do you have any clue what goes into that process" seems likely to be a piece of that.