Memes... I cannot think of a lower form of humor.
Humour is not a prerequisite for memery. A meme is a unit of social information. Humour does not factor into them.
The only thing internet memes provide less than humor is relevant information. On anything.
A meme is more about social pressures and conformity than it is about "information" in the same way that you normally would think of the word. In much the same way that you can tell where someone is from by their accent, or their job by the words they tend to use or the way they tend to dress, people tend to conform to their social group, consciously or subconsciously.
For example, hating elves is, indeed, a meme.
Gimli and Legolas were competitive, but Gimli wasn't the same sort of psychopath a DF player's dwarves typically are, and didn't instantly chuck Legolas off that long narrow bridge over the chasm in Moria even though he completely had the chance to make an "unfortunate accident".
(Oh, and "Unfortunate Accident" is also a meme.)
To show how this is a matter of social pressures and conformity - just consider the reactions you would probably get for talking about how much you love elves in every possible way, and would never think of harming a tree, or how magma is something that no true dwarf would ever want to harness, for fear of getting burned by its hot flow. After all, Dwarf Fortress is a game that is all about winning, and winning with all your dwarves in perfect health, and in peace and harmony with nature.
While I don't doubt you'd be able to bring yourself say it, and wouldn't strictly fear some sort of reprisal for deviating, you know inherently that you are completely flying in the face of everything that, jokingly or not, DF fans hold up as the standards of DF playing or talking about the game, just as everyone would instantly recognize it if you suddenly started talking with a New York or Southern accent you didn't have, or tried talking with the jargon of a different line of work than your own in the office.