And this young lad felt the full force of Liverpool fandom when a stadium full of Kop supporters chanted and jeered at him, eventually managing to strip off his controversial kit.
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Faux pas: Rowdy Liverpool fans quickly noticed the Red Devils shirt in their midst
Terrifying: The foolish lad faced the wrath of the crowd
But in a Red Devils shirt - particularly one with the name of former Everton player Wayne Rooney on the back - he was never going to stay unnoticed for long.
Rough treatment: One Reds supporter decided to take matters into his own hands
Struggle: The boy couldn't stop irate fans from taking his United shirt
When he refused, the Reds fans took matters into their own hands, mobbing him and removing the United shirt. In celebration, they sang Kop anthem You'll Never Walk Alone.
Defiant: He resisted one woman's attempt to force a Liverpool strip on him
Moody: He was understandably annoyed and soon sloped off
The boy returned a few minutes later, and seems to have learned the error of his ways - this time around, he was wearing the altogether less contentious shirt of Malaysia's national team.