Since 2010-2011 fans have been heckling Floyd Mayweather for ducking Manny Pacquiao.. At almost every event he has attended he has felt the wrath of the fans.. Even when walking in the streets of Vegas fans heckled him... Here are a few links..
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http://www.fightline.com/fans-heckle-floyd-mayweather-with-manny-chants/ ..... http://www.boxingscene.com/forums/archive/index.php/t-475181.html ... http://ihatelupica.blogspot.com/2015/01/mayweather-heckled-by-fans-calling-for.html ....
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http://www.dailymail.co.uk/sport/boxing/article-2923859/Floyd-Mayweather-heckled-fans-calling-Manny-Pacquiao-fight-pound-pound-king-watches-LA-Clippers-win.html
I reckon' the last link at that basketball game where after fans were heckling him and Manny was there he "grew" some Cojones... Beheheheheee..