My first question would be, has your DS always behaved this way with you in public, or is this a new development? If the former, it may mean he has difficulty accepting you as a reliable authority figure, but he respects his teachers. If the latter, it may mean he's bottling up frustration at school all day, and then erupting when he feels safe at home.
Nothing new per se.
It's not so much that his misbehaviors bothers me, and Zen Scanner articulated it well. I feel like DS loses control over himself and turns impulsive due to *some* triggers. His triggers vary a lot.
