Not in theory, but I remind you that the head teacher is usually a teacher in the department. You offended him, he said hello, and you were in trouble. Although I have never seen anyone fail to reply without a diploma, theoretically speaking, as long as the reply fails, graduation is not allowed. Brother, have you offended the head teacher? Let the counselor or student cadre bring something to write in the review area and apologize to the class teacher. It is also very uneconomical if graduation is not allowed to laugh because of the defense. But according to your situation, you have passed the defense, at least in this link, he can't card you, but there are many ways to card you, such as commenting on your employment agreement, handling registration cards, household registration transfer, files and other places, which are difficult for you to do. Listen to me, how can people not bow their heads under the eaves and honestly apologize to the class teacher? Anyway, they won't lose anything, otherwise you will really be stuck there; It's too late to admit your mistake.