Anwar said:
Ira Behr was PO'ed enough that the Defiant was in First Contact at all, you'd know he'd go nuclear at the TNG crew fighting in the Dominion War.
What he was so mad about was Berman had every intention of DESTROYING the Defiant in Earth orbit as they beamed Worf off the ship. He said in an interview that Berman essentially said "If I want to destroy it I will."
He answered with, "And I'll put it in the next episode anyway to screw with your movie."
In the end Behr won, and even expressly put that Defiant was adrift but repairable.