Why did Portia always look skeptical?

I'm assuming Haley is a great actress and this is how she was supposed to play the role, but I found that Portia always looked skeptical/confused/questioning. It seems like she never fully believed the person she's talking to, as if she's breaking the fourth wall and watching her co-stars act. Almost as of she's always about to burst out laughing.

I questioned early on if it was bad acting but after reading some posts, it's apparently supposed to portray Gen Z anxiety? It was a bit off-putting for me, and I'm curious if others felt the same way.