A nice observation from Cassandra, but I can't understand why she would bother to voice it.
Wasn't she like one of the Bat-Family step children?
She was probably just jelly because the whole point of Batman dressing up like a bat is to distract his enemies with fear and aggression.
Yes, and English wasn't her first language either. Body language was. One of Cass's character traits is that she doesn't speak much. That's why I can't understand why Cass would bother to say such a thing. It isn't like her.
Also, she ain't jelly cos' her costume is also made with the purpose to strike fear into criminals and completely hide her identity.