I've never worn makeup to the gym (rarely wear it at all), but why get bothered if other people do?
I don't actually look at other gym goers long enough to notice whether or not they're wearing makeup, but I figure most who are wearing it are doing so because they're coming to the gym after work/after being out and about. 10:10 and especially 10:19 sound as insecure as they think the women they're judging are. Y'all obviously aren't working out hard if you're staring at other people's faces.
My personal gym annoyance is when people show up sick and sneeze all over the equipment.