I do have some sympathy with Snyder, he quite obviously hadn't a clue what was going on. One thing that's noticeable is he has a picture of a young girl on his desk, was he married? Did he have a family?
Snyder did know very well what was going on, but he was keeping it secret because the authorities (i.e. the Mayor) wanted him to keep it a secret. He was a typical authoritarian personality, subservient to those more powerful than him, while taking pleasure in tormenting those he had the power over (the students). Exactly the kind of person I could never stand. I didn't have such a principal, but sadly, I knew some teachers who were just like that, taking their inferiority complexes on the students and treating them like crap.
And yeah, I have some empathy for Snyder (but not sympathy), but only as much as I have for... Warren.
EJA apparently has more sympathy for Snyder than for Buffy, and doesn't grant her the kind of understanding he has for Snyder. He makes it look like Snyder was some poor powerless nerd in her school, while Buffy was a popular homecoming queen making fun of dateless nerds, when in fact neither is true at all. Buffy was neither popular by the time she moved to Sunnydale, and never made fun of any of the powerless students in her school, quite the opposite (Jonathan). But she was killing the monsters and saving the world while Snyder was constantly on her case (it's even worse when you know that he did know about the supernatural events) and even told her he enjoyed getting her expelled.
ETA, you got the power dynamics backwards - he was in the position of power and he was the one constantly bullying her.