The closing line reads "for brothers everywhere" so I guess it taps into something extra for guys in terms of that brother dynamic too.
Since the Director John Carney went to that same Christian Brothers School as a kid and delt with all the horrible treatment that was known to exist in that school at the time, I interpreted the " For Brothers Everywhere " credit at the end as being addressed to all the brothers that went to that school and had the lived through that treatment. The movie exposed some of that and I think he was paying homage to all the past kids at that school by bringing it up in the film.
Just my take.
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