Best/Worst Assessment Ever

My roommate came up with a pretty ingenious costume for me this year. See if you can guess what it is (sorry, I didn't take any pictures):
I wore an outfit that was all pastel (green plain bermuda shorts and a pink sweater vest), my hair in pigtails with ribbons, and freckles on my face. On the front of my sweater was a big sideways "V". On the back I had a sign that said "<90degrees".

Get it? I was a cute angle! Hahahaha. Okay, not that funny, but appropriate for a geometry teacher. Nowhere near as good at the statistics teacher who came as a Mean Girl (entry in her Burn Book: "Didn't find y-hat"). As expected, some kids thought my costume was funny and most rolled their eyes. However, there was one reaction--that many had--that I didn't expect.

Kid: "Ms. L, what are you?"
Me: "Guess"
Kid: "Ummmm... a little kid? A nerd?"
Me: "What's on my shirt?"
Kid: "Tape?"
Me: "Yeah, what shape is it?"
Kid: "A 7?"
Me (turns around): "See if this helps?"
Kid: "Ninety... Oh! You're a right angle!"
Me (turns back around): "Does this look like a right angle? I am an angle, but what kind?"
Kid: "I don't know. It says 90 degrees on your sign"
Me: "Look again. It doesn't just say 90 degrees"
Kid: "Yes it does. You're a right angle."
Me (to myself): "I'm not a right angle, but apparently I am the worst geometry teacher ever."

So I learned that about half my kids do not know what an acute angle is and/or do not know how to read greater than/less than signs. This is a problem. I'm okay with them not getting the pun, but seriously, you think that's a right angle? Whatever it is that I think I'm teaching is clearly not sticking. Scariest Halloween ever. I will be forever haunted by the terror of our nation's poor math education.