Honestly you took his comments to seriously, probably because he suggested that you where doing the very thing you set out not to do, but he’s definitly wrong, since all you’re friends think he’s wrong. BUT HE’S YOUR TEACHER, seriously this isn’t some fair and equal place, just nod you’re head “oh yes sir, thank you for helping me”, don’t do anything in front of him, and act the way you are everywhere else. Because when it comes to dealing with teacher complaints, even if they are in the wrong, you get hosed.