How many jerks can you fit in one movie? (Spoilers obviously)
I would use stronger language, because "jerk" is an understatement, but I don't want to break the IMDB rules.
The parent and student at the beginning were jerks for obvious reasons, as were Felicity and Darcy's Aunt, Rose, was it?
Liz's sister and Gabrielle, and Darcy's sister were all jerks for pushing Liz towards Darcy when it almost got her in trouble several times.
Then towards, Liz was also a jerk. She knew she had feelings for Darcy, and she was denying it and trash talking him any chance she had. So it was a quite a bit hypocritical of her get so angry with him when he did the same thing. She knew darn well he liked her, and that he was probably playing coy, she just seemed to be looking for reasons to hate him at that point. And Liz's sister was a jerk at that point too, for storming out on her boyfriend because of what she overheard, only to go back to defending Darcy almost immediately after.
Darcy was really the only one who wasn't a huge jerk, except for maybe a few minutes in the very beginning, and he quickly apologized.