Someone complaining about Halloween costumes is not criticizing a flawed institution. That is their hang ups on costumes. If they don't like them, don't buy them. If they don't want their kids dressing up in said costumes, that is their right as an American. If someone dresses up in an offensive costume (Hitler, Bin Laden, etc) then the issue is not with the costume and the holiday, but the people wearing it.
I'm also not sure how the "if you don't like it, don't do it" thing applies when it's quite obvious that the only people doing it are the ones who do like it, don't understand the problem, or just don't care.
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Iro's Top 100 Movies v3.0
I really just want you all angry and confused the whole time.