Fat Joe doesn't want anything to do with Tekashi 6ix9ine because the troll rapper cut a deal with the feds and told on his friends.

"I thought he was a nice guy, and now he can’t be my friend, he can’t come around me ever again,” said Joe. “Those are rules. He crossed that line. I don't even understand if I go to a club and they play his songs. I pray for people who cross that line,  when they talk to the police and they snitch, I pray for them ... I'd die before you'd see me in a picture with Tekashi 6ix9ine."

Joe once warned Tekashi about avoiding trouble, but those words obviously fell on deaf ears.

Other rappers have also weighed in on 6ix9ine lately. Nipsey Hussle said he only got big because the public reacted to "clown sh--" and Offset also explained that the "Gummo" creator has to live with the consequences because he chose street life.

You can peep Joe's words on Tekashi below at the 19:13 mark.