I should not laugh at this .... But I am

She's a lawyer. Why wouldn't she?

He just insulted and mocked her, I was just wondering how that offence was worthy of being sued

It's not. He ought to counter-sue and take her for everything she has.

Well, if she was questioning the witness, and the witness was like this, then it is considered defamation of character. Lawyers, judges, and other court officials during a case are protected under the law, and defamation of character is illegal, and she legally had the right to sue the witness.

?