Dont ever bother worrying what these people think of you. I think half of the people who respond to these types of threads - screw that, 95% - have never been in a position of authority over anyone. The trainer is clearly incorrect that box squats put you in a wheelchair. And he probably could've phrased it better. But it was probably the 3rd thing he saw in the last minute that he would not want the AD to see if he walked in, and it was probnaly the 108th time that day that he had to address something. I'm not surprised that he didnt want to debate this. Also, if you think you can get approval from the football coach or whomever, fine, try it, but dont be surprised if another authority figure refuses to take a teenager's side over the weight room supervisor - and I use that phrase conciously. He's not a college s&c coach, in all likelihood he's not a strength coach at all, but schools need a warm body in there for liability reasons and, fair or not, his word goes.