What was the most homophobic experience you faced in school? (From teachers not students)

I remember in the 6th grade my teacher said being gay was disgusting and an abomination (I live in Canada btw) and remember very well how much this hurt since the people who picked on me for being gay now got support from the teacher. I just want to know how common this is. I'm 21 now but I wonder if it's still like that in schools or if things are different. Please share your experiences. And if teachers are reading, have you ever done something to help an LGBTQ student?