I think this resonates with a lot of people. Your confidence can be undermined by a troll, or by a student’s passive aggressive eye roll, or a snarky comment on an evaluation form. It’s so easy to forget the 20 people you helped, and fixate on the 1 or 2 people who probably deal out hostility to everyone they come across. Or maybe they’re a decent person who just chose to take out all their stress and anxiety on a random blogger.