So he used the name "MathBoi".
Lets see ... that name may provide a hint to the source of his rage, at least according to the Oregn Department of Education.
The Oregon Department of Education recently encouraged teachers to register for training that encourages "ethnomathematics" and argues, among other things, that White supremacy manifests itself in the focus on finding the right answer. In February 2021, their newsletter advertised a "Pathway to Math Equity Micro Course", designed for middle school teachers to make use of a toolkit for "dismantling racism in mathematics." The event website identifies the event as a partnership between a California Office of Education, and others.
Math = racist. The term "boy" (and assumingly its alternative spelling "boi") is racist.
Time to release him on his own recognizance - since we can now blame his behavior on systemic mathism.