What do you mean by "aloof manner"? As far as I'm aware, snaps' updating mechanism is quite reasonable and doesn't suffer from the many update related issues that apt/debs have, especially when users want packages not included by their distribution.
Or you can just avoid hacking your hosts file and breaking other tools, and set your Snap and Apt proxy configuration to a non-existent value, or firewall their ability to reach those hosts.
Or configure them properly by disabling auto-updates, configure unattended-upgrades appropriately for your needs, and only update your apt packages from a known, internal mirror endpoint that doesn't change until you point it to a new timestamp.
That's how it works in the real world, in production. It's not 1994, we don't hack hosts files anymore.
https://snapcraft.io/docs/managing-updates#p-32248-pause-or-...