She's actually one of my favorite teachers but she gets edgy about this topic. She wasn't just having an off day, She is constantly getting people in trouble for stuff like this. Honestly. I am pretty offended, I am not trashy AT ALL!

hmmm... from the other side: in my kids' school, there's a huge problem with the preppies vs. goths. This year they had to introduce a new school policy like that -- no dark nail polish, no tee shirts with certain designs on it, etc. (there's loads more but I forget what it is) It REALLY has cut down on the number of incidents of goths/preppy kids fighting. Sounds absurd that nailpolish would make such an impact, but it does. Last year my daughter came home nearly every day with a tale of some new fight, and this year we hardly ever hear anything about it. Unfortunately, even among your peers, how you dress affects how others see you.
We don't have a problem like that in our school. Thanks for pointing this out, this could be the reason why they don't like this kind of stuff in my school. It's interesting how cutting down on all of the "goth stuff" has minimized the amount of fights.

Its only nail polish -- why get yourself into trouble with teachers and administration?
Yeah, thats a good point. I'm being stubborn about this now, I want to prove a point, but you're right, I will just end up getting myself in crap.