Vulgarities in school?

I personally disagree with any word being "forbidden." It's stupid. Saying "you're not allowed" only encourages it. I hate the idea that any word is outlawed because the meaning isn't polite, with exception (maybe) to racial slurs.

This is true, when something is forbidden the usual action would be temptation to do it.

If it's not used as an insult against someone, I find it okay.
Although I do get annoyed if someone is speaking and they use it in about every sentence.

Swearing after every sentence is rather awkward and usually just done by kids who either don't have respect for others, or just do it to be "cool."