Parents are not the enemy. Some of them do act like they think they are your boss, however. Usually the younger the age that you teach, the more this is true.
You won't see many parents taking their child to the emergency room and trying to tell the doctor how to do the surgery. At some point they trust that the doctor has been trained and knows what he or she is doing. They should have the same attitude toward teachers.
Some parents will try to push you around, or even bully you. Don't let them.
Remember that your duty is to serve your students. Parents can help or hurt that cause. Do your best to respect them and even include them in the process if necessary. Just don't feel like you have to kiss up to them and never let them push you around or disrespect you.