Anyone who takes Halloween costumes this seriously is either intellectually lazy or just stupid. Even if there was actually something wrong with ridiculous or offensive Halloween costumes, they would not be the problem in and of themselves. Pointing to offensive costumes needing to be banned or discouraged or whatever is just a convenient way for someone to say, "look at me, I care about this issue...can't you see how much I'm changing the world?" Putting on airs pretending not to be sexist or racist doesn't mean you aren't, it just means you're aware of the fact that you're doing something wrong. Our society has huge gender and race problems and pretending we don't by targeting costumes is just ridiculous. Let's look a little deeper and try to solve the actual problem with actual solutions aimed at changing the way our society functions. This whole thing is akin to extinguishing a fire by aiming the extinguisher at the tips of the flames.
This hilarity is the reason I included race.