These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Gunther and Tinka come off as this. They are blatant jerks most of the time, especially towards CeCe, which is somewhat justified because CeCe herself can be quite a selfish jerk herself. On the other hand, they don't really do anything bad, yet they are still treated like the devil simply because of their Lack of Empathy, even when they try not to act like jerks.
Logan was also a case of this as well. He had legitimate reasons to hate CeCe, such as for not having any sense of responsibility for her actions, being lazy, and being an all around jerk. When he fires her, CeCe just smites him afterwards even if he really did nothing to wrong to deserve it. Despite his legitimate reasons to not stand CeCe, it still made him the bad guy in the eyes of others, especially Rocky.
Moral Event Horizon: During CeCe's interactions with Logan. She crosses this by being a jerk to Logan after he fired her for not playing by the rules. To top it all off, she sabotaged his date with Rocky. These actions proved to be so unforgivable that Logan can't stand being around CeCe anymore.
Suspiciously Similar Song: A reasonable facsimile of "Bad to the Bone" plays as Rocky enters detention clad in her new "bad girl" outfit.
They Just Didn't Care: Possibly the only explanation as to how a FAMILY show on the DISNEY Channel was able to get away with a joke about eating disorders, which later made Demi Lovato speak out against it (see below).