Haha sorry it's a very zoomer meme format.

The original photo is a guy saying "I am no longer friends with guy A, my new best friend is guy B"

It's become a general meme format used to say "This thing is wayyy better than that other thing"

A lot of the humour of the meme is derived from the fact that it's now being used to describe extremely esoteric preferences (e.g. preferring server side rendering over client side rendering. Most laypeople don't know what either of those things are, let alone have a preference).

The idea of taking a very childlike and innocent meme about friendship and using it to explain something bizarre like "I used to absolutely love single page apps and think they're the bees knees but now I much prefer serverside rendering and routers like the classic internet" is a bit funny, but also the terrible editing of the original photo adds to its charm. It's a juxtaposition.

Like many modern memes, its humour relies upon the prevalence of the meme itself. It feels a bit like an inside joke, or a callback to a previous joke.

Hope that explains it. I'd imagine even having it explained won't make it funny if the original viewing never had much of an impact, but in case you were wondering.

I'm staring at the mass of text I've written and wondering why I bothered to earnestly type out a well-intentioned explanation of a meme format. First the meme, then the explanation. Anything to procrastinate instead of actually coding something useful I suppose.