So your argument is that Furries are weird? You've met teenagers right?

Both subcultures are a self expression thing. Is it cringe? Sure, to us but so is Goth kid ennui and the obsession with The Craft and putting in fake vampire fang. But to that kid it's a fun something that helps alleviate some of the stress and boredom during a stressful time where they don't have a whole lot of autonomy yet.

And the whole "fursona" thing is generally fairly tame. I doubt they really choose to express that much in a school setting just like we left the Vampire the Masquerade Tabletop RPG at home because letting your full freak flag fly at school still has consequences of other people not understanding your niche and being jerks about it.

The exception is those that have have some sort of mental disability in which case the animal aspect of chosen presentation is really not the problem because the kid will still be odd. The autistic kid really into anime who Naruto runs through the hallway between classes would just find something else to be odd about because that's just how it is. Teachers still enforce boundries of what is acceptable non disruptive behaviour in their classes and all but the least able kids know that there is a place and time for doing as they please. Do we really have to care what harmless weird things kids are up to between classes?