VIDEO : Diddy's Son Justin Combs -- Thanks for Fighting for Me

Diddy's son is totally cool with his father brawling with his football coaches -- in fact ... he's thanking Diddy for the fight that cost him multiple felonies.
Justin Combs broke his silence about his dad's arrest by posting a pic of himself and Diddy ... with the caption, "I thank God for having a father that's always there for me.. Love you pops!"
TMZ Sports broke the story -- we're told Justin's strength and conditioning coach, Sal Alosi, had called him out ... saying, "I don't care if your dad's here. I'm going to treat you just like I treat everyone else." Our sources also say Alosi told Justin to leave and NOT come back for the rest of the summer.
We're told that's what set off Diddy.