WiFi Networks Sync Across Mac, iOS Devices

Does anyone know how to turn this off? It's very annoying.

If I join a WiFi network on my laptop (MBA), it will sync the WiFi network name with my iOS devices. They will then try to join.

Two examples:

I joined my iPhone 6's personal hotspot with my MBA. Two minutes later, my iPad dropped its own LTE connection through it's built-in cellular and joined the personal hotspot of my iPhone.

Trying to avoid this, I joined the hotel's WiFi network on my MBA. 30 seconds later I see a notice on my iPad pop up to join the hotel's network.

Is there a way to stop syncing joined networks so that I can use one network on my MBA and not force it to other devices?