Each of those boys took a spot on the Varsity team that a girl should have had. That girl, who lost out on a Varsity place, ended up on the Junior Varsity team and displaced another girl who didn't get to be on the track team at all.
Those girls' feelings don't matter. The only feelings that matter are those of the boys who want to win by racing against the girls. Because somehow it's their right to compete. Unlike the displaced girls, who have no such right. Somehow it would be cruel or hateful if these mediocre male athletes couldn't take part in sports. But the mediocre female athletes who would have just made Varsity, or just made the cut for JV if the boys hadn't pushed them out? Is it a travesty and a hate crime if they have to give up their dream of being on the high school track team? Nah, in their case, it's only sports, it's only high school, what's the big deal, can't get worked up about this.
But only in their case. For the stunning and brave male 'girls', it's life and death, and to say 'sorry, you haven't made the cut as it's a female team' would be to commit violence against them.