Personally I love witty conversation. I like listening to it and I also find it quite fun when I can get in a witty retort or pun etc.
With certain people I have a lot of fun with that because we all know that we're joking around and we don't really mean to cut anyone down maliciously etc.
HOWEVER, I have been convicted often times about the way I respond to people in the forums. I get into lots of conversations and its not uncommon to run across some really bad arguments and really bad responses and often times the people with the stupidest responses are also the most arrogant and insulting.
In those cases there is nothing my flesh would love more than to rip into them with some really biting sarcasm.
There are two motivations in this that I see in myself. One is pride. My impulse is to use sarcasm to demonstrate my superiority to that person. By rideculing them and poking fun at them, I exalt myself and demonstrate how much more I know/better I am etc.
Another is essentially repaying slights and insults. When someone treats me badly I would like to pay them back in kind by rideculing them with sarcasm etc.
Numerous times I've been in the midst of typing a reply and had to delete the whole thing and just bite my tongue because I was convicted that my motivations were wrong. Usually the primary one for me is pride.
Sarcasm has its time and place as does everything, but I think it is generally a mistake to use it seriously on fellow Christians and even non-Christians most of the time.
I guess my final guide would be that its generally fairly difficult to be sarcastic lovingly
Not impossible, but the two often don't go together.