Richie Incognito is playing the "everybody does it" card to explain why he hammered Jonathan Martin with threatening, racist, and violent language -- and further, he says it's just how he and Martin talk to each other.
In his first extensive interview, Incognito -- who's been suspended for his actions -- basically said players in NFL locker rooms, black and white, use the n-word freely.
Incognito admitted being "embarrassed" by the voicemail he left for his teammate ... where he called him a "half n**ga" -- and said he feels it's inappropriate for him to ever use that word. Strange ... since he's also saying he does it all the time.
As for bullying? Incognito told FOX NFL Insider Jay Glazer ... he didn't think this was a case of bullying ... and was more "an issue of mine and Jon's relationship, where I've taken stuff too far, and I didn't know it was hurting him."
Incognito also shared text messages he says his "best friend" Jonathan sent him after the controversy exploded. He claims Martin said ... "I don't blame you guys. I blame some stuff in the locker room. I blame the culture. I blame what was going on around me."
So, we gotta ask ...