I'm going to change my neighbors internet password.
Why would you change their password?
There are a couple of reasons. One is to protect myself in case they hack my computer.
Being worried about your neighbor hacking your computer is not a reason to change their password. You should not mess with something that doesn't belong to you since it will just annoy them and make them mad at you. Especially since so many people are working from home now, it may even prevent them from being able to do their job.
I don't care about them really.
It's really not okay to change their password. It may even be illegal to mess with someone else's network like that, and it doesn't seem worth getting into trouble over. You should make sure your network is protected and not worry about theirs.