Interact with them when you are angry. If they do something that upsets you walk away. The worst thing you can do is say or do something that when you calm down you will regret.

Make your child feel as though they are worthless.

-make them feel unwanted or like they are only a problem to you.

-teach them that they have to be perfect.

never tell your child something that you will feel sorry for saying later on... ive heard of people telling their child that they hated them and wished they were never born... things that are said like these can never be taken back and the child will never forget it, they will remember it for the rest of their lives and will not forgive you for it so if they get you that angry that you feel as if you are going to say something hurtful lock yourself in your room until you have calmed down and then you can go and deal with the situation.

cuss at them

or

not protect them from someone else because they're trying to make that other person happy.

Parents should never be afraid to apologize to their child or admit they made a mistake.

Not show humility.

Try to live through their kids

Physically/mentally abuse them.

I know a woman who taught her child the alphabet and 1-10 backwards before the child entered general school. Amusing? Yes, until you learn that she didn't teach the child how to do either thing *forwards*, and taught the backwards version as if it was the right way. She did it for chucks and giggles. She got arrested. I agree with the police.

One thing a parent should never do is neglect the child (ren) nor not let them learn i.e. not going to school making them stay home.

A parent should never tell their child they hate them.

Call them a disrespectful demeaning name.

Stop protecting them.

...put theirself before the child. Kids and their needs should always come first.