Does a principal have the right to embarrass student in front whole senior class?

No, a principal absolutely does not have the right to embarrass a student in front of the whole senior class. This is unprofessional, potentially harmful to the student's well-being, and likely violates school policies and potentially even laws depending on the nature of the embarrassment. Schools have a duty to provide a safe and supportive learning environment, and public humiliation directly contradicts that. While principals have authority, it's not absolute and must be exercised responsibly and ethically.