I have no idea whether the parent in question has a child who is “gifted”. Whether she does or not, comparing her child to any other is ridiculous because every child has individual strengths and weaknesses. Moreover, even if a direct comparison is made on any specific measure (a test score, a picture, a race time, etc.), good manners should dictate that the one who happened to “rank higher” shouldn’t comment negatively on the one who was “ranked lower”, ESPECIALLY when they’re children.
However, while I don’t think learning should be viewed as a competition, I do think that every child should have the opportunity to learn new content in school and to be able to challenge themselves. Knowledge shouldn’t be rationed. While I can understand her frustration, she is handling it wrong.
Here is my advice for your fellow parent:
Never use the word “bored”. It is both ambiguous and inflammatory. To a teacher, while it could mean that your child already knows the material, it is equally (if not more) likely to mean that the work is too difficult for your child or that the work just isn’t fun. Instead, when talking to the school use specific terms about your child’s knowledge of specific content. Don’t discuss it with parents unless they initiate the topic.
The word “gifted” is extremely squishy. There are different definitions of giftedness, which are measured with different types of assessments, each with different thresholds. It is entirely possible for the same child to be identified as gifted on one measure but not by another, or even on the same measure given at different times. This word should be used sparingly, only being productive when used to demonstrate that by their own criteria your child qualifies for services from their school or other organization. Discussing your child’s giftedness with other parents generally serves no purpose other than to foster resentment.
If you feel your child needs the opportunity to learn more, arrange to talk to the teacher at a time of their convenience. Describe as precisely as possible their current knowledge and skill level. Don’t just complain or expect them to solve your problem. Instead, cooperatively suggest a solution that will place minimal demands on the teacher (grade skipping, working independently on the computer, working independently on work you send in and correct at home, etc.). Be flexible and open to any workable solution they might suggest, recognizing that they don’t have to help. Be prepared to supplement at home.
For information related to every facet of giftedness as well as resources for supplementing, I highly recommend the Hoagies website.
https://www.hoagiesgifted.org/index.htm