The American appeared on Good Morning Britain to promote his fight with Tyson Fury on December 1.
But the 40-0 KO king only had eyes for Joshua, who he claims has been ducking him.
WBC champ Wilder, 32, roared: "We spent four months trying to make something happen and they [Joshua and promoter Eddie Hearn] didn’t want to fight.
"Look at how easy it was to make this fight. This is the biggest fight in the world. I tried to make the fight. They didn’t want it to happen.
"Me and Fury about to see this thing going on baby, we about to see who’s the biggest and the baddest in the world, something you were too coward to do in your own country.
"You were a coward and you know this, your whole team know this. You said different things over and over. You manipulate, you're compulsive liars.
"The audience put their hard-earned money into this, this is an emotional sport. Enough is enough. Fury already told y’all, Joshua had a career plan and Deontay Wilder wasn’t in it from the start."
An unusually muted Fury, 30, was on the show alongside Wilder, looking trim with promoter Frank Warren in tow.
There were no sparks flying between the two, who emphasised their mutual respect when asked about their showdown.
On his calm demeanour, Fury explained: "I’m giving him his little five minutes of fame on British TV. That’s why I’m not interrupting."
Frank Warren had more to say – agreeing with David Haye's claim that the winner of this bout should be considered above WBA (Super), IBF, WBO, and IBO champ Joshua, 28.
He added: "It’s two perfect styles, there's three best heavyweights in world, take your pick of 'em.
"But these two are the only ones to have the guts to step up and fight each other. The best fighting the best.
"The winner of this will be the best heavyweight in the world because you have the undefeated lineal champion against the 40-0 WBC champ."
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