In my school we had to take permission from our teacher to go to washroom but I had developed avoidance because of my stutter and used to leave classes whenever I saw the opportunity to. Some teachers were cool about it and didn't say anything while others used to ease their pent up stress by yelling at me for as long as they needed to. I didn't hate myself for this but the teachers because they knew what I was going through and still never helped me. (2-3 did)