Lukaku's celebration today was not in the Addebayor class from a few years back.
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And I can remember seeing Rooney give the Everton fans the cupped ear on more than one occasion in the past few years.
Had Rooney scored I think his celebrations would have been muted, but he was cheered loudly by the United fans, Lukaku got plenty of abuse so had every right to retaliate IMHO.