I'm another UK fan and have been for years. It seriously sucked for me at first in school because people found it weird that i was listening to A: Pop music and B: JAPANESE Pop music 

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Now however, i don't try and hide it in the slightest, why should I? It doesn't make me feel effeminate in any way at all but then my musical taste is pretty diverse altogether so it would be impossible for me to feel different for everything i listen to xD
My best friends listen to metal, and have no problem with it at all.
Now... trying to explain my love of Morning Musume is a different kettle of fish