Police must have reasonable suspicion to stop you and probable cause to search you or your vehicle. "You looked suspicious" is not enough.
You have the right to remain silent during any police interaction. You do not have to answer questions beyond identifying yourself in states with stop-and-identify laws.
You have the First Amendment right to record police performing their duties in public. Officers cannot legally order you to stop recording or confiscate your device without a warrant.
The 14th Amendment guarantees equal protection under the law. Selective enforcement based on race, religion, national origin, or other protected characteristics is unconstitutional.