Well, the OP asked and got a reply from a GM that she paraphrased in this post because CCP policies don’t allow quoting them verbatim:
Basically, their current stance on the issue appears to be that anything that the game mechanics give the opportunity to do isn’t considered harassment, even if it’s the same player that’s being repeatedly targeted and you’re following him around.
Note that this doesn’t mean you can do anything that the game mechanics allow you to do, just that it isn’t considered harassment. You may still be banned for doing things that the game mechanics make possible, but that are declared exploits or expressly forbidden in the ToS/EULA.