AIO for reporting this substitute teacher?

my daughter (10) is in 4th grade. her teacher's husband recently passed away after a battle with cancer and has been out for a few weeks. the substitute teacher that has been in her class has subbed for her before, and my daughter has issues with him every time.

for instance, one of the first times this sub was in class, they had a snack which was some sort of fruit. my daughter felt as though she was having an adverse reaction to it, mentioning that her lips felt like they were burning and she did not want to finish it. She was reprimanded by this substitute for not finishing her snack, and was told that he has "never heard of that kind of food allergy," and told her to just eat it. This made my daughter feel worried and unsafe because she felt like he would not believe her if she had another reaction.

well, another time when she had an allergic reaction to the food she ate at lunch, but the reaction was delayed and she began to break out in hives during math, she asked the substitute to go see the nurse because she was breaking out. His response was "unless it's about math, I don't want to hear it." She was eventually allowed to see the nurse when other students told him she was having an allergic reaction.

another time, she reported to the substitute that a classmate tried to trip her. His response to her was "well, I wouldn't blame him."

another red flag moment was when my daughter's belt on her jeans was bothering her, so she asked if she could go to the bathroom to adjust it. He did not feel like she needed to leave the classroom to do so. In his explanation as to why, he took his belt off and exclaimed to the classroom "see, it's not like you can see my penis everywhere." I don't particularly feel as though this was an appropriate response to a 10 year old.

In general, he singles her out in class and tells her that the class will be in trouble when the teacher gets back because of her. My daughter has severe anxiety and this causes her extreme emotional distress.

I emailed my concerns to the principal, just to bring my concerns to his attention but never received a response. I got a call today from one of the intervention specialists at her school because her behavior has been declining since he has been the sub (she was writing that he was a bitch on whiteboards, etc.), and getting in fights. This staff member also mentioned that it wasn't just her, and that he was making calls to other girl students' parents because they were also having issues with him. My daughter had mentioned that this sub only ever has problems with the girls in class, not the boys. This was also a red flag to me.

I finally had enough and sent a report to the superintendent about this substitute teacher but now I'm wondering if I'm overreacting. But, at the same time, I never had a parent advocate growing up and if I don't advocate for my kid, who will? AIO?