Is a defendant's in-custody statements that he used abusive and threatening language to a witness during a period of time in custody admissible?

Defendant challenges testimony by all three witnesses recounting his in-custody statements. He relies on the general notion that abusive and even threatening language does not violate a penal statute and is inadmissible under factor (b). (See People v. Wright, supra, 52 Cal.3d 367, 425-426, 276 Cal.Rptr. 731, 802 P.2d 221, and cases cited.) Defendant also argues that evidence of other circumstances surrounding the outbursts was not independently admissible, e.g., thrown liquid, torn pants, unrelated "match bomb" incidents, and defendant's maximum security status.