When seeking information is sarcasm seen as a deliberate lie? I will be completely honest in admit that I do not get sarcasm. 

When a person says something sarcastic I end up believing what they say, until they give that look that almost says 'Um, that was sarcastic. Duuh!" And I'm left at the butt of the joke. 

My problem here seems to stem from a simple truth to lie perspective. If I were to ask someone a question I expect an honest or helpful answer, where sarcasm may be neither of these things.

Example: "Do you have a bathroom?" 'No, we go in a bucket.'

Say I'm at a new place, asking a person I've never met or only met once or twice. In this case I was hoping for a simple 'Down the hall to the left.' as an answer but I've been met with sarcasm. 

Even though I'm pretty sure this house has a bathroom I do not know this 100%. If I did not know sarcasm existed (which in my mind and experiences is basically the case) I have two options. Believe the information I have been given, or look that person in the face and say "You have just lied to me."

It would seem that calling a person out on this deliberate lie (this sarcasm) would be extremely rude, and force the person to admit to giving me false information. At the same time this seems to be the only way to obtain the truth, the only real answer I ever even wanted to hear. 

I understand that sarcasm can be funny, in context. My basic understanding is that once you get to know someone well enough you will catch those subtleties in there speech, whereas with another less known person they believe their own lie (sarcasm as knowing the information to be false but not sharing that fact) making it hard to tell if it truly was a lie simply because it was a joke 'Duuh!'

There are many more examples of sarcasm I have come across, some easier to catch than others and some easily rectified by a simple 'Just kidding.'

To sum all this up googling Sarcasm gives me: The use of irony to mock or convey contempt. Which does not sound lighthearted at all, the word Mock standing out. 

I'm not asking why people are sarcastic but why it's seen as such a go to form of comedy when it seems so detrimental to the person being mocked as well as detrimental to the person being sarcastic (at least from a Buddhist standpoint)? Is sarcasm as a response to a question, when that question is looking for an undeniable true answer, seen as bad Karma?

Any information on the Buddhist thoughts on why we use sarcasm and what it is, as well as from other/more modern sources on the subject (ex.South Parks Sarcastiball episode) would be greatly appreciated if I Am to understand this experience more. Thank you.
Sarcasm isn't a deliberate lie, because the intention isn't to lie or mislead, but it is wrong speech, because it has the capacity to hurt people.

Per Buddhism, unless a statement is true and beneficial, it is not right speech. And joy derived from the suffering of others isn't wholesome.

Ironically saying "You lied" to someone who is being obviously sarcastic can be seen as a kind of sarcasm itself, since it can be viewed as being affectedly sincere.


  The criteria for deciding what is worth saying
  
  [1] "In the case of words that the Tathagata knows to be unfactual, untrue, unbeneficial (or: not connected with the goal), unendearing &amp;
  disagreeable to others, he does not say them.
  
  [2] "In the case of words that the Tathagata knows to be factual,
  true, unbeneficial, unendearing &amp; disagreeable to others, he does not
  say them.
  
  [3] "In the case of words that the Tathagata knows to be factual,
  true, beneficial, but unendearing &amp; disagreeable to others, he has a
  sense of the proper time for saying them.
  
  [4] "In the case of words that the Tathagata knows to be unfactual,
  untrue, unbeneficial, but endearing &amp; agreeable to others, he does not
  say them.
  
  [5] "In the case of words that the Tathagata knows to be factual,
  true, unbeneficial, but endearing &amp; agreeable to others, he does not
  say them.
  
  [6] "In the case of words that the Tathagata knows to be factual,
  true, beneficial, and endearing &amp; agreeable to others, he has a sense
  of the proper time for saying them. Why is that? Because the Tathagata
  has sympathy for living beings."
  
  — MN 58
  http://www.accesstoinsight.org/ptf/dhamma/sacca/sacca4/samma-vaca/