Your child may be bored by classes which do not provide an academic/intellectual challenge worthy of his potential... and/or he may have an attention deficit, such as ADD or ADHD. Wrightslaw provides information on ADD/ADHD.

Has your child been evaluated for possible attention deficit?

It sounds like the teacher knows your child is advanced, therefore telling the teacher that your child is gifted may not be helpful. However asking for advanced academics may be helpful.

Originally Posted by KJP
Keep in mind some teachers are just whiners.
While some teachers may be whiners, that may be best dealt with by gently probing for the degree of the problem which caused the teacher to send the e-mail. For example, a person might ask for facts such as:
- the frequency of the child's problem behavior,
- the length of duration of the child's problem behavior,
- a statement of the impact of the problem behavior,
- what has been tried in the classroom to curb the problem behavior,
- what suggestions the teacher has for partnering with the child and/or home to address the problem behavior.

Originally Posted by KJP
You might let her know that when she emails you, you get upset, you yell, your kid ends up in tears and it is a bad night. She might stop.
Or this may result in negative consequences ranging from a note in your child's file which may preclude his acceptance at another school, to child services being contacted and your child being removed from the home.

Escalating a situation is not a recommended approach for problem solving and advocacy. Instead, one wants to deescalate any situation, and communicate in a fact-based, solution-oriented, forward-looking, and unemotional manner.

The goal must always be: helping the student.