Lately we've had a rash of folks coming through who post a link to a message where it simply is a disagreement between two or more individuals (generally a disagreement in terminology, traditions, or belief systems). IMO, that doesn't truly capture the essence of a snark. A snark is something where you take that which is already ridiculous (inherent snarkworthiness) and provide some form of commentary that utilizes some form of technique (i.e., reductio ad absurdum or non sequitor) to provide a "zinger"... some sort of comeback that brings laughter and spit takes to members of the community. If you're unable to do it (most often in the case of being totally dumbstruck by a comment), then post the specific section that strikes you as astonishingly stupid in the hopes that other people can provide the humor that you cannot.
In other words, cite what precisely is it that you're finding funny, and take it to the next humor level or hope that someone else can do the work for you. It's a refined art... feel free to read some of the other messages here to get a feel for it all.