How do teachers deal with difficult parents?

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That's tough!!! There was a parent who just burst into the classroom of the Grade II teacher accusing her of not dealing his kid right. The parent points his finger to the teacher in front of her students in the class. The children were scared and also the teacher is nervous of what to say? The teacher just stood quiet until the the parent was done. The teacher was not able to say anything not after 2 hours. She was in shock and embarrassment. If you are in the position of the teacher, what would be your reaction? why do some parents are so rude in doing this without asking why his kid has that situation in school? Horrible thing!!!