I think cats understand a lot more of the social and emotional content of conversations than they do words or logical connections.
So I could see Pica understand she was "being blamed" without knowing about what and getting offended about it.
Another example is Pica doesn't like being laughed at. (so I have to be careful because she can be funny) but it hurts her feelings somehow.
And then she rolls around with them and it... it's kind of indecent!