Replying to Age racism??????

At my school in the past 2 days there is this grade 9 girl who is sitting where she shouldn't be. this is a spot strictly for grade 11s and 12s, it is marked very well (its carpet and at a different level then the floor of the halls) Everyone at the school knows the rule, only grades 11 and 12. There is another spot for grd 10. grd 9s dont get one. but today some lonely, gutless grade 9 ventured into the "Deep end" (its the name of our spot) and decided to stay. I know her, she is an attention seeker and gives me dirty looks ever since grd 2. we asked her to leave, and we told her the rule that the students of the school abides by. the teachers know and all, its legit. So after 30 mins of heckling she wouldn't leave and a big crowd has appeared (300+ ppl. its a big deal if a grd 9 even walks through it.) numerous teachers the VPs and the principal are all there.
This year we got a new principal who does not understand the tradition here. so she made a nice long announcement comparing the "incident" today to rosa parks in 1955.
What is this, its our spot, they can not come in. its also ironic that the principal calls our school a "Town" because we are bigger then one, bla bla bla. but in a town every citizen gets to vote, In our school the "mayor" is a dictator??

Sparknotes: Grd 9 comes into the grd 11/12 spot and wont move wants to sit new principal thinks we are discriminating, but its just our spot.

What do you guys think? Are we being "age racist" or is a spot a spot and thats that?