Synths are isolated. They are predominantly lower class, the "clanking masses". They can, and often must, live in environments unsuited to biomorphs or anything alive. Synthetic bodies have different, tougher tolerances than biological ones. They do not need to eat, breathe, drink or even sleep.
Radical synth-rights groups believe that the clanking masses are a splinter that can become something separate from humanity. They wish to accelerate this process.
"Binary chatter", also called "modem cant", began as an efficient way for synthmorphs to share technical information. An easy hack of voice systems allows for rapid, information dense noise instead of slow, human imitating speech. This new language conveys technical, mathematical, and computational information with infinitely more grace than any spoken language, and it can even be encrypted. Synth societies are developing their own metaphors, their own jokes, their own culture.
Inspired by the binary chatter of the tech-priests of Warhammer 40k.