Ryan Garcia's been trollin' Devin Haney heavy for his alleged link to Diddy ... but the boxing star tells TMZ Sports at the end of the day, it's no laughing matter.
Garcia -- who is currently suspended from boxing -- spoke with us in Los Angeles just a few days after Diddy was arrested in New York on sex trafficking and racketeering charges.
The allegations center around alleged "Freak Off" parties ... and with photos showing Haney with Diddy in the past, Garcia has trolled Devin on social media.