(Photos) Gay boxer beats man who's been trolling him on Twitter after seeing him at a barbing salon

Openly gay boxer Yusaf Mack unleashed his anger on a man he claims has been harassing him online over his sexual orientation.
TMZ Sports confirmed paramedics were called to the L A Clippers shop in Philadelphia Saturday evening ... after Mack pummelled  the man in front of customers and employees.

Witnesses say Mack attacked the dude while the victim's head was in a sink in the middle of a wash.

Mack tells us he got sick and tired of the online harassment and decided to confront the guy face-to-face. Mack is unapologetic and says the guy got what he deserved.

The victim who didn't want to talk ,has since issued several homophobic statements on his Facebook page, including:

"I rather have a video of some beating me up then a video of someone seeing me take a d*** up my a** any day."

The man says he will retaliate against Mack ... "Me and him gonna fight again.".