Because he probably dealt with the nut-huggery of Arsenal and Chelsea fans for so long, before he was a soccer fan and it made him not like Arsenal and Chelsea. So he went for the rival Man U.
or
He is a nuthugger himself and goes for Man U because they win.
or
He is originally from Manchester and simply moved to London. So he has a connection to Man U even though he lives in London.
ps.. didn't mention the other london teams because they suck.
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