Cara Anderson has been in been in Cobra Kai long enough to know the basics of it- she was loyal to it. More importantly she is loyal to her friends. If her friends hated someone, she hated them more. All of that changes when she gets some alone time with Robby Keene... long enough to realize she might actually like her best friends enemy. Not to mention, he was in Miyagi-Do, someone they always found themselves competing with.