Deontay Wilder just WENT OFF on Anthony Joshua -- saying he fought Andy Ruiz like a COWARD ... and says AJ will get "demolished" if they ever get in the ring together.
"He didn't want no engagement," Wilder said about the Ruiz fight ... "He was just scared."
"You got a 6-inch height advantage, you got an 8-inch reach advantage. Why is you running from the smaller guy?"
Wilder says Joshua's style was boring as hell -- "Punch, hold and grab like you scared of confrontation!"
"When you're dealing with Deontay Wilder ... I woulda came in and demolished him!"
AJ has said his plan is to eventually fight Wilder to unite the heavyweight belts, but Deontay says AJ is full of crap ... claiming Joshua wants absolutely NO SMOKE.
"He definitely don't want me, for sure. I live in his dreams, I'm his worst nightmare."
"A lot of people read into [Joshua's] bulls**t and we can understand and identify and we know it's bulls**t coming out of his mouth. We just don't have enough toilet paper to wipe it as it comes."
Bottom line ... Wilder says he's ready to destroy Joshua whenever AJ is willing to sign the contract -- but he ain't holding his breath.
In the meantime, Wilder is gearing up for his own rematch against Tyson Fury in what could be the best fight of 2020.