This is how IRL police function as well. They're a lot less noticed IRL due to the fact that there's a large population in LA and more equipment/CIs to work with.
This is their job, they're meant to enforce laws and issue citations where necessary. Some cops are more lenient than others and some may even have a positive/negative bias towards some people.
The speed cameras have scripted leniency, that doesn't mean the speed limit is what they allow.
As said previously, this is their job. When it reaches an unreasonable extent, IA does step in and handle it as necessary.
Overall, almost everything you've listed here falls under their responsibilities or a human bias. If you feel you're being harassed and targeted by one officer in particular, take IC action against it. You can handle it through IA should you be able to gather evidence and prove the bias, handle it through personal interactions with him, or have you and a group of friends deal with it as you see fit (within the rules, of course).
When it reaches an unrealistic extent is when it becomes an OOC issue. If you find that he's acting NOTHING like a police officer would in real life, it may be time to consult the staff team or talk to him one-to-one about it. If he's being corrupt, you can speak with PD command on an OOC level should he not have OOC corruption permissions.