... then there are aesthetics.  You just don't say certain words because they look and sound ugly.  How can I communicate when there are ugly words that I think of, and are meant to say, at that particular moment?  By not talking at all!  Or just replying "okay."  Words that I don't like saying include "awesome" or... "dude."  Actually, "dude" does not go through my head often.  But I semi-cringe when I hear someone say it... actually "cringe" is a word I don't like seeing or hearing.  

This doesn't have anything to do with word aesthetics, but "Holy fucking shit" comes to my head often or "what the fuck does this faggot want."  But my moral code does not allow me to say it.

Edit: Actually, nevermind, all words piss me off.