Is there such a thing as too much honesty?

Well, in real life, I’d have to say yes.  It’s just common sense.  There are thoughts which only you should have because to spew them onto an unsuspecting victim may not solve anything.  Sometimes these truths are harsh because of something that is intrinsically you.  Sometimes, the words in your mind are simply rude and would serve no other purpose than to hurt/insult/demean/etc.