If you don't use ivp6 for anything and your ISP doesn't support it theres not much of a need to have it enabled. To disable it we need to edit /etc/modprobe.d/aliases
nano /etc/modprobe.d/aliases
By default you will have the following line
alias net-pf-10 ipv6
Replace it with the following
alias net-pf-10 off alias ipv6 off
You can now remove all the ipv6 stuff from /etc/hosts and once you reboot ipv6 will be disabled
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