I wasn't there, of course, to hear how he said his "obscentity". But some words, have become part of "normal" speech. Stand on a street corner in any major city, and listen to how many "obscene" words you hear--you would think that everyone is using them.
Assuming that the op really only used f*ck in a non offensive way, the fa blew the situation out of proportion, IMHO.
[PS: There is a clothing company, I think, whose name is ....; would a company, just a few years ago, every have taken a name like that?--the times are a changin!]