From the 305 commentary:
Will Smith: The only one with the c-word is four, because — I remember because Peter yells it in my face.
Armando: What did that feel like?
Will: Like being hit by a hurricane. Just like, WOW!
Armando: Several times.
Will: Yeah.
Armando: We did many takes of that.
One of the other guys: He calls you a mincing cunt, doesn’t he?
Will: Yes, he does. Yeah. The reaction is quite real. Because he does it really quietly, starts quietly, and then just blasts and I just go [inarticulate sound of terror].