It completely amazes me that people are posting comments about this teacher, aren't really posting the problem with this teacher. It upsets me that people can write about arguing whether this teacher was joking or not. It doesn't matter whether he was joking or not and the fact that people can debate that issue means that they are just as messed up as this teacher. The truth is in this country, there are standards for every profession. The educational system is set up where for every school district, there are guidelines for the curriculum taught, including the numeric value assigned for the correct information provided on a given assignment. When a teacher assigns a -20% to a student's paper and then calling them a loser, not only is he being unprofessional, he is being dishonest because in school grading guidelines, -20% doesn't exist. If this teacher isn't going to give a student the correct grade, which is obvious in this case, how is he to be trusted to fairly grade papers? Perhaps, this is a case of discrimination against this student's mental capacity?