I very much try to be a "allegations are allegations" person but I'd agree that there is enough smoke here to think that it has the potential to get a bit ugly.
From what I can piece together (and it isn't based on the actual filing but on news reports - which can miss widely on the legal analysis), it appears that the victim is claiming that (a) he was sexually assaulted; (b) he and the family asked for accommodations; (c) the request for accommodations was denied; (d) he was given an ultimatum - either attend in-person school in the same classes as Blume or attend school virtually; and (e) if he had been a girl, his requests for accommodation would have been given different treatment. Hence, the ICRC complaint (disparate treatment based on sex).
In other words, the victim's lawyers will argue that the Roland Story School District would have reacted differently if Blume had sodomized a female with a pencil but, because the victim was a male, they minimized the situation and essentially forced the victim to modify his school attendance as opposed to forcing change on a two-time state wrestling champion.
If and when this case proceeds to a trial after the victim's attorneys receive a "right to sue" letter from the ICRC, they better hope that people like
@HawkMachine (who apparently didn't feel like the "sharpening the pencil" incident was outrageous) don't serve on the jury.