I don't see having to deal with parents as a "negative." Rarely are they rude; much more often they're simply concerned about their child, and if you take the time to communicate well with them about what you're thinking and what you're doing, you will find your interactions with them to be pleasant. Of course, every so often you come across one whose neck you want to wring because of the way they're treating (or not treating) their child, but if they are truly being abusive or neglectful then you can do something about it (namely, get protective services involved). I can only think of a few times when I became really frustrated with a parent...usually they are reasonable people who just want the best for their children.