Community - Hungover Britta
The fact that Lori hooked up with Shane never bothered me. She thought her husband was dead (also UNF Shane).

The scene that made me really dislike her is when she flipped out on Rick for killing Shane when she had said herself to Rick that he'd probably need to be killed at some point.

It also bothered me that she as all "NO MATTER WHAT IT'S NOT YOUR BABY!" to Shane. Uhh... actually... And I mean he had every reason to think Rick was dead too.