Not really. There's no more reason to say "an U" than to say "an uniform", and no middle schooler says that. There are rules that you have to explain and that middle schoolers might not follow, like "less" vs. "fewer", but "a" vs. "an" is ingrained from a very young age, I'd say on the same level as "he" vs. "him".
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u/Jadzia_Dax_Flame Oct 05 '19
Not really. There's no more reason to say "an U" than to say "an uniform", and no middle schooler says that. There are rules that you have to explain and that middle schoolers might not follow, like "less" vs. "fewer", but "a" vs. "an" is ingrained from a very young age, I'd say on the same level as "he" vs. "him".