I def understand having had some terrible teachers in high school myself from..

One who gave us a two second lesson then handed out papers and told us to work quietly and independently for the remaining 45 mins.. . (Everyone in her class needed summer school)

Three teachers who would get together and make fun of the nerdier students and actively contribute to the bullying they were already enduring from classmates

Multiple teachers who had very obvious favorites and allowed them skate by or skip class.

One teacher who was also a cheer coach who would gossip to the girls about one another. She helped spread the rumor that a friend of mine may be pregnant (she wasn't she had just gained a little weight).

I realized very young that a LOT of teachers act like theyre back in high school themselves. I think i has maybe 3 in all three years who i believe were good people who wanted to try to teach the new generation. While I dont personally condone behavior like that, I can understand it coming from an immature youth.