Definitely stress that everything you do in class is a learning experience ... and the brain learns, long term, only by repitition. Your rules, which essentially concern self control, are important precepts which all children need ... and can only be acquired through practice. I assume you are using two minutes of recess practice as a consequence for a white card? Also, as to talking to other parents ... until you actually hear from other parents, don't concern yourself. Most adults are very good at recognizing loose canons and will likely ignore your troubled parent's concerns. Finally, when all is said and done, we can only control what is under our control. During the conference, your only goal is to control your tone of voice and response ... if you do that, the meeting was a success, from your point of view ... if worse comes to worse, take a "strategic retreat" and simply say, "I'll need a day or so to think over the best response to your suggestions." This will give you the time you need to work out a plan with your administrator about the best next step.