Although I'm supposed to be an 'Idealist', I can be quite cynical at times, and could probably give some of the other temperaments a run for their money.
I'm more interested in WHY someone thinks the way they do about people and things.
Although like sade mentions, these days I'm not one who wants to hang around a cynical environment or cynical person for a super long time. It's just draining (not to mention unpleasant), esp. if the person is so far down that path that they just rant, and don't make any effort to change either the situation or their perspective on the situation.
I think the cynical person is typically very unhappy/in pain himself - hence, he projects that unhappiness/angst out to the world at large. So it's more interesting sometimes to find out what's going on with that person's life, to figure out why that person might be so cynical about the World. And with really cynical people, I've found it can actually be kinda easy to just let the words flow over you, and then flip the table on them and just redirect the whole conversation to other topics. If you're not deeply impacted/affected by what they say, and don't fall into the negativity with them, then they kind of lose their momentum. The rants only continue if you allow them to continue. :-)