Well, whether one is a rebel or not has few things to do with dropping f bombs or not.

So the irony is misplaced, it's not just "wannabe rebels" that can curse.

I know very true rebels, including people who actually got in prison for fighting a military dictatorship, that curse like it's going out of style. And others that are very well spoken and high society mannered.

That said, if you want to write about it, a sign of being more of a rebel than not, would be not to go with the prudishness of writing it as "f", as if it's some big deal.