Going down to the planet, introducing yourself to the pre-warp civilization, making no effort to hide the fact that you are aliens from another world, planning your shore leave and preparing to fuck as many of them as you can? Not a prime directive violation.

Rescuing one of your kids who accidently breaks one of their rules and is immediately condemned to death, and asserting that as a member of your crew he is subject to your punishments and not theirs? Prime directive violation.

Taking one of the locals up to space to see the thing they consider to be a god, and openly defying the very foundations of their civilization’s system of law and order? Not a prime directive violation.