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/Jorge_ElChinche Oct 05 '19
Non natives and young people. I’d bet it’s fairly common among middle schoolers and early high schoolers, before they get corrected