Is this senior quote inappropriate?

Yes. Also it doesn't make sense. Idiots can fly, just as everyone else can - from an airport.

Lol they might not let you use that one but give it a try! I’ve heard of people doing theirs backwards so it just looks like random letters and the school is like yeah whatever but then someone realizes what it says and it ends up a meme or on IG

Everyone hates their high school. 10 years from now, they'll all be joining online groups related to high school and talking about how those were the best years of their lives. Don't write anything in your yearbook that you don't want to have to explain to your children.