I just want to say that my home network is entirely ethernet, and I have a few fiber connections in there that are also ethernet.

The vast majority of the ethernet connections out there are done over category (5/5e/6/6a) cable, at least when it comes to end users, but that's not the only thing that can transmit ethernet.

802.11 is extremely similar to ethernet, though, very notably, it is not ethernet. It is ethernet compatible, and mostly just adds things like encryption and source and endpoint radio identifiers... It more adds to ethernet than it changes anything. Bring so similar, the end to end ethernet connection is almost entirely unchanged when there is a wireless link in the chain...

It is, of course, different, as it has some different methods for handling issues, and other things, but ethernet is in there.

Fact is, ethernet is not your category cable, nor your 8p8c "rj45" cable connectors.

There are so many protocols and standards that work together to make networks function that many have not observed outside of the practical application of LAN networks. Thus all the terms get conflated together because the vast majority have not observed these things used in any other context.

Category cable is just a standard for twisted pair wiring. "Rj45" is actually a very specific connector and signaling that has nothing to do with LAN networks. Most of the wiring standards used are born from other purposes, and few know the history behind it.

Oh well. It's not worth getting upset about it.