Swearing at your teachers may be protected by the First Amendment
"Although Mr. xxxxx could have selected a more desirable choice in prose such as "I respectfully dissent" or "I am dissapointed with your attitude, sir, and politely ask you to cease and desist," the use of the words fucker and fucking nonetheless do not amount to criminal conduct in this particular context."
The case never came to court, but the proposed defence (via kuro5hin) makes for entertaining reading. An unnamed Colorado teenager was accused of “interfering with the staff, faculty, or students of an educational institutional” for having called his principal “a fucker, a fag, and a fucking fag” - and his counsel’s defence was that the word fuck is a perfectly normal word these days which shouldn’t cause offense to someone whose job it is to be subjected to that sort of abuse comparatively regularly.
It’s wonderfully written. Here’s another excerpt:
The state has the power to protect its citizenry from actual harm, and thus has the power to outlaw one yelling “Fire!” in a crowded theatre. […] However, yelling “Fuck!” in a crowded theatre does not create a clear and present danger to anyone and thus canot be outlawed. Although they are both four letter words that start with F, the distinction is constitutionally significant.
Well worth a read.