Well, calling the current political, social, or even game discourses debates is probably too generous. That implies discussion which means an attempt at listening to the other if only to hear their point of view enough to counter it. At this point, much of what I see are the use of memes to perpetuate Straw Man fallacies.
It seems like memes are perfectly positioned for this purpose. They are cute and funny. This leads to people backing the ideology in them to think of them as non-threatening so they more easily share memes. Very topical, they get across the shot at the enemy in an amusing way.
A couple examples:
None of this seems to be about convincing people to change their opinion so much as attacking each other. This whole thing is disappointing.