It's too bad the question wasn't well received. It's probably because the majority of the members who responded are either sexist, homophobic, transphobic, or all of the above. I agree with you completely: makeup is gender-neutral. Not only are some of the answers on this thread bigoted, but they don't make any sense.
1. Makeup is not inherently feminine. It's an item. Female biology is feminine. Even if it were, feminine males are not necessarily gay, so the connection from makeup to gay makes no sense.
2. To the people saying the act is gay, but it doesn't make the makeup-wearing male gay: that answer is so abstract. What does it mean for an "act" to be gay, especially when the act has nothing to do with sexuality?
3. It isn't good enough for someone to say men wearing makeup is wrong on a de facto basis. Why is it wrong? Some of you answered that it is wrong because makeup is feminine and there needs to be a distinction between the sexes. If referring to #1 and realizing makeup isn't feminine doesn't answer your question, try this:
Why does there need to be a greater distinction between the sexes? What does it say about you that you want to remove your entire gender as far away from the other as possible. Biology determines ***. That's all. Besides, what purpose does this separation provide besides perpetuating inequality and hate and stereotypes. As someone else mentioned, you wouldn't make racist stereotypes, so why the hell is it okay to make sexist stereotypes?
I'm curious about people who made this claim though. What about gender fluidity? Some people don't identify as a binary gender. What do you think about those people (at the risk of getting more sexist, homophobic, transphobic responses)?
4. ..Okay, but let's look at what makeup really is. Why do people believe it's feminine? One use of makeup is for acting. Many of you absolved wearing makeup for this purpose, because actors need to look good. If makeup makes people look better, why shouldn't everyone have the freedom to make themselves look better? No, forget about attracting a mate. Say, someone wants to look better for themselves. The same way a man (as an example for you sexists) wants to work out. He doesn't care about chicks. He's doing it to feel better about himself and feel good. Makeup is the same way. It makes *some* people feel better.
And I'm really glad so many of you think makeup makes people look cheap. Fantastic. I wear full face makeup everyday. Eyeliner. Lipstick. Foundation. Eyeshadow. Mascara. Settling powder. Concealer. The whole deal. If you in real life said that makeup is for cheap hoes, you would just look like an *******. Because you are one.
Thanks for the thought-provoking thread, OP. Peace.