I haven't had experiences with teachers in particular calling out or making fun of my stutter - but during my time at school, I had many family members and also friends really poke fun at my speech. It's really hard for me to think about those times. People who I thought were my friends laughing at me, and my own Mother making fun of me for the way I spoke, knowing that there was nothing I could do to help it. It really hurts to think about that now, and I think it will always be hard to think about . I also had times of self abuse in my life, from hitting to scratching to cutting. When I have a particularly bad day with stuttering, I still want to grab something and start to hurt myself, just to punish myself. It's something that's extremely hard to go thru, and I'm sorry you had to endure that. I really hope you aren't self abusing anymore.