I am being laid off at the end of the year by my current employer. I asked my principal for a letter of recommendation. It took him a month or longer to finally write the recommendation. I had to remind him several times. Lo and behold, it was negative. He stated in the letter that I had challenges with classroom management and he would recommend for hire only with provided support. He only visited my classroom twice and the students were never out of control. Should I confront him regarding this assertion or should I just not use the letter? Part of me wants an explanation and the other part of me say let it go. By the way, he is being involuntarily transferred to another school and possibly even demoted after being a principal for one year. How do I respond when prospective employers ask about my previous employer/supervisor?