Boxer Ryan Garcia Gets Ass Kicked By TikTok Stars Dixie D'Amelio, Addison Rae

Boxing superstar Ryan Garcia just caught the first L of his career ... and it wasn't at the hands of Tank Davis or Luke Campbell -- he got beat up by some TikTok stars!!! Okay ... so, that's not true at all. BUT, the 22-year-old phenom *did* hit…