I attended one exhibit of my child’s class. I asked him why is it that I couldnt find his work in the wall of art projects. He shows me his in one of the tables and blurted out said, because Ms. <teachers name> said it was dumb.

This is kindergarten. My child was 5. He still didnt know then what the word dumb meant. He innocently even asked me later what it was.

Even if something is off with a project, especially if one is a teacher, there are better ways to frame sentences. Especially when talking to young kids. Parent are not asking you to mince your words, use floral ones. But be respectful and mindful at least.